Use Window coordinates for IME composition bounds, auto resize

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index 9a9d98688ea08783ad088bdc281acba758000c12..12ee60e35f6c8d02905a90f5b9364598064670d6 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -490,7 +490,7 @@ class CONTENT_EXPORT RenderViewImpl
   void GetSelectionBounds(gfx::Rect* start, gfx::Rect* end) override;
   void FocusChangeComplete() override;
   void GetCompositionCharacterBounds(
-      std::vector<gfx::Rect>* character_bounds) override;
+      std::vector<gfx::Rect>* character_bounds_in_window) override;
   void GetCompositionRange(gfx::Range* range) override;
   bool CanComposeInline() override;
   void DidCommitCompositorFrame() override;
@@ -564,6 +564,8 @@ class CONTENT_EXPORT RenderViewImpl
   FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, PaintAfterSwapOut);
   FRIEND_TEST_ALL_PREFIXES(RenderViewImplScaleFactorTest,
                            ConverViewportToScreenWithZoomForDSF);
+  FRIEND_TEST_ALL_PREFIXES(RenderViewImplScaleFactorTest,
+                           GetCompositionCharacterBoundsTest);
 
   typedef std::map<GURL, double> HostZoomLevels;