Add DisableCompositingQueryAsserts to FrameView::useSlowRepaints

Android build hits this assertion all the time, rendering debug build useless.

This disabler isn't entirely correct, but assuming blitting-based scrolling
won't last long, it should be okay with a FIXME.

BUG=357345

Review URL: https://codereview.chromium.org/212223007

git-svn-id: svn://svn.chromium.org/blink/trunk@170626 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/frame/FrameView.cpp

@@ -1235,6 +1235,10 @@ void FrameView::adjustMediaTypeForPrinting(bool printing)
 
 bool FrameView::useSlowRepaints(bool considerOverlap) const
 {
+    // FIXME: It is incorrect to determine blit-scrolling eligibility using dirty compositing state.
+    // https://code.google.com/p/chromium/issues/detail?id=357345
+    DisableCompositingQueryAsserts disabler;
+
     if (m_slowRepaintObjectCount > 0)
         return true;