Introduce bottom controls to CC and let it respond to scrolling

content/browser/android/content_view_core_impl.h

Index: content/browser/android/content_view_core_impl.h
diff --git a/content/browser/android/content_view_core_impl.h b/content/browser/android/content_view_core_impl.h
index 3a445e8517b26243964c70caaf55ef7544472eef..b40501565956dda922b7aa2e0dbeb440f5855d0f 100644
--- a/content/browser/android/content_view_core_impl.h
+++ b/content/browser/android/content_view_core_impl.h
@@ -314,8 +314,10 @@ class ContentViewCoreImpl : public ContentViewCore,
                        const gfx::Vector2dF& page_scale_factor_limits,
                        const gfx::SizeF& content_size,
                        const gfx::SizeF& viewport_size,
-                       const gfx::Vector2dF& controls_offset,
-                       const gfx::Vector2dF& content_offset,
+                       const gfx::Vector2dF& topBarTranslateYCss,
+                       const gfx::Vector2dF& topBarShownYCss,
+                       const gfx::Vector2dF& bottomBarTranslateYCss,
+                       const gfx::Vector2dF& bottomBarShownYCss,
                        bool is_mobile_optimized_hint,
                        const gfx::SelectionBound& selection_start);
 
@@ -381,6 +383,7 @@ class ContentViewCoreImpl : public ContentViewCore,
   gfx::Size GetViewportSizeDip() const;
   bool DoTopControlsShrinkBlinkSize() const;
   float GetTopControlsHeightDip() const;
+  float GetBottomControlsHeightDip() const;
 
   void AttachLayer(scoped_refptr<cc::Layer> layer);
   void RemoveLayer(scoped_refptr<cc::Layer> layer);
@@ -425,6 +428,7 @@ class ContentViewCoreImpl : public ContentViewCore,
 
   gfx::Size GetViewportSizePix() const;
   int GetTopControlsHeightPix() const;
+  int GetBottomControlsHeightPix() const;
 
   void SendGestureEvent(const blink::WebGestureEvent& event);