[PDF] clear() and drawPaint() where applying the initial transform twice.

BUG=b/10845219
R=edisonn@google.com, djsollen@google.com

Author: vandebo@chromium.org

Review URL: https://chromiumcodereview.appspot.com/24130010

git-svn-id: http://skia.googlecode.com/svn/trunk/src@11420 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/pdf/SkPDFDevice.cpp b/pdf/SkPDFDevice.cpp
index e80984e..d13d30c 100644
--- a/pdf/SkPDFDevice.cpp
+++ b/pdf/SkPDFDevice.cpp
@@ -786,10 +786,8 @@
     }
     SkRect bbox = SkRect::MakeWH(SkIntToScalar(this->width()),
                                  SkIntToScalar(this->height()));
-    SkMatrix totalTransform = fInitialTransform;
-    totalTransform.preConcat(contentEntry->fState.fMatrix);
     SkMatrix inverse;
-    if (!totalTransform.invert(&inverse)) {
+    if (!contentEntry->fState.fMatrix.invert(&inverse)) {
         return;
     }
     inverse.mapRect(&bbox);