Content: Disable overlay optimization.

Partial revert of the following patch:
https://codereview.chromium.org/675313002/

BUG=436689
TBR=tedchoc@chromium.org

Tbr since code-review is broken and Ted gave me the LGTM.

Review URL: https://codereview.chromium.org/797833002

Cr-Commit-Position: refs/heads/master@{#308012}

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

@@ -812,6 +812,7 @@ public class ContentViewCore
 
             mContainerView = containerView;
             mPositionObserver = new ViewPositionObserver(mContainerView);
+            mContainerView.setWillNotDraw(false); // TODO(epenner): Remove (http://crbug.com/436689)
             mContainerView.setClickable(true);
             mViewAndroidDelegate.updateCurrentContainerView();
         } finally {