Tweaks around AppBar demos

Change-Id: Id24b71d88071412816668d791c2deedd68b7a6db
diff --git a/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_pin.xml b/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_pin.xml
index 2809b04..ee3114d 100644
--- a/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_pin.xml
+++ b/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_pin.xml
@@ -18,10 +18,12 @@
 <android.support.design.widget.CoordinatorLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:id="@+id/col"
         android:layout_width="match_parent"
         android:layout_height="match_parent">
 
     <android.support.design.widget.AppBarLayout
+            android:id="@+id/app_bar"
             android:layout_height="192dp"
             android:layout_width="match_parent"
             android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
diff --git a/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_pin_with_fab.xml b/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_pin_with_fab.xml
index cff9d92..adf7900 100644
--- a/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_pin_with_fab.xml
+++ b/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_pin_with_fab.xml
@@ -18,6 +18,7 @@
 <android.support.design.widget.CoordinatorLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:id="@+id/col"
         android:layout_width="match_parent"
         android:layout_height="match_parent">
 
diff --git a/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_scroll.xml b/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_scroll.xml
index a865ca3..fc85db0 100644
--- a/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_scroll.xml
+++ b/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_scroll.xml
@@ -17,10 +17,12 @@
 
 <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:id="@+id/col"
         android:layout_width="match_parent"
         android:layout_height="match_parent">
 
     <android.support.design.widget.AppBarLayout
+            android:id="@+id/app_bar"
             android:layout_height="192dp"
             android:layout_width="match_parent"
             android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
diff --git a/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_with_image.xml b/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_with_image.xml
index ebdbf10..930c1a8 100644
--- a/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_with_image.xml
+++ b/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_with_image.xml
@@ -18,10 +18,12 @@
 <android.support.design.widget.CoordinatorLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:id="@+id/col"
         android:layout_width="match_parent"
         android:layout_height="match_parent">
 
     <android.support.design.widget.AppBarLayout
+            android:id="@+id/app_bar"
             android:layout_height="192dp"
             android:layout_width="match_parent"
             android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
diff --git a/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_with_image_insets.xml b/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_with_image_insets.xml
index 95f13c3..6e2ba9b 100644
--- a/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_with_image_insets.xml
+++ b/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_collapse_with_image_insets.xml
@@ -18,12 +18,14 @@
 <android.support.design.widget.CoordinatorLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:id="@+id/col"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:fitsSystemWindows="true">
 
     <android.support.design.widget.AppBarLayout
-            android:layout_height="256dp"
+            android:id="@+id/app_bar"
+            android:layout_height="wrap_content"
             android:layout_width="match_parent"
             android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
             android:fitsSystemWindows="true">
@@ -31,7 +33,7 @@
         <android.support.design.widget.CollapsingToolbarLayout
                 android:id="@+id/collapsing_app_bar"
                 android:layout_width="match_parent"
-                android:layout_height="match_parent"
+                android:layout_height="256dp"
                 app:layout_scrollFlags="scroll|exitUntilCollapsed"
                 app:contentScrim="?attr/colorPrimary">
 
@@ -41,7 +43,8 @@
                     android:layout_height="match_parent"
                     app:layout_collapseMode="parallax"
                     android:src="@drawable/photo"
-                    android:scaleType="centerCrop"/>
+                    android:scaleType="centerCrop"
+                    android:fitsSystemWindows="true"/>
 
             <android.support.v7.widget.Toolbar
                     android:id="@+id/toolbar"
diff --git a/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_parallax_overlap.xml b/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_parallax_overlap.xml
index 98158e7..2b12b91 100644
--- a/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_parallax_overlap.xml
+++ b/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_parallax_overlap.xml
@@ -18,10 +18,12 @@
 <android.support.design.widget.CoordinatorLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:id="@+id/col"
         android:layout_width="match_parent"
         android:layout_height="match_parent">
 
     <android.support.design.widget.AppBarLayout
+            android:id="@+id/app_bar"
             android:layout_height="192dp"
             android:layout_width="match_parent"
             android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
diff --git a/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_scroll_tabs_pinned.xml b/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_scroll_tabs_pinned.xml
index ea94c8a..c7bc615 100644
--- a/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_scroll_tabs_pinned.xml
+++ b/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_scroll_tabs_pinned.xml
@@ -18,10 +18,12 @@
 <android.support.design.widget.CoordinatorLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:id="@+id/col"
         android:layout_width="match_parent"
         android:layout_height="match_parent">
 
     <android.support.design.widget.AppBarLayout
+            android:id="@+id/app_bar"
             android:layout_height="wrap_content"
             android:layout_width="match_parent"
             android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
diff --git a/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_scroll_tabs_scroll.xml b/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_scroll_tabs_scroll.xml
index 580c5c4..239c036 100644
--- a/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_scroll_tabs_scroll.xml
+++ b/samples/SupportDesignDemos/res/layout/design_appbar_toolbar_scroll_tabs_scroll.xml
@@ -18,10 +18,12 @@
 <android.support.design.widget.CoordinatorLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:id="@+id/col"
         android:layout_width="match_parent"
         android:layout_height="match_parent">
 
     <android.support.design.widget.AppBarLayout
+            android:id="@+id/app_bar"
             android:layout_height="wrap_content"
             android:layout_width="match_parent"
             android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">