Plumb temporary view detach calls through WebViewChromium.

See Change-Id: I92ba2f44359643fee63f30b9c35b1ae4183e4245

Bug: 14313621

Change-Id: Ib7d6957c804d4abfded9b8e20860ee06ae4086c3
(cherry picked from commit d49bfc0d304a58e1308bc77b1dfd6877a6d26690)
diff --git a/chromium/java/com/android/webview/chromium/WebViewChromium.java b/chromium/java/com/android/webview/chromium/WebViewChromium.java
index 38f28eb..c3f572b 100644
--- a/chromium/java/com/android/webview/chromium/WebViewChromium.java
+++ b/chromium/java/com/android/webview/chromium/WebViewChromium.java
@@ -1941,6 +1941,14 @@
         // we won't need it again.
     }
 
+    public void onStartTemporaryDetach() {
+        mAwContents.onStartTemporaryDetach();
+    }
+
+    public void onFinishTemporaryDetach() {
+        mAwContents.onFinishTemporaryDetach();
+    }
+
     // WebViewProvider.ScrollDelegate implementation ----------------------------------------------
 
     @Override