Introduce bottom controls to CC and let it respond to scrolling

content/browser/renderer_host/render_widget_host_view_android.cc

Index: content/browser/renderer_host/render_widget_host_view_android.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_android.cc b/content/browser/renderer_host/render_widget_host_view_android.cc
index 0a02371dbabe3a326bde2fe762bc2e9c24647ab0..00f425965ecb02866f891f8cba8b1af116d3ed6b 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -635,6 +635,14 @@ float RenderWidgetHostViewAndroid::GetTopControlsHeight() const {
   return content_view_core_->GetTopControlsHeightDip();
 }
 
+float RenderWidgetHostViewAndroid::GetBottomControlsHeight() const {
+  if (!content_view_core_)
+    return 0.f;
+
+  // The height of the top controls.
+  return content_view_core_->GetBottomControlsHeightDip();
+}
+
 void RenderWidgetHostViewAndroid::UpdateCursor(const WebCursor& cursor) {
   // There are no cursors on Android.
 }
@@ -1002,8 +1010,7 @@ void RenderWidgetHostViewAndroid::SubmitCompositorFrame(
   }
   if (surface_id_.is_null() ||
       texture_size_in_layer_ != current_surface_size_ ||
-      location_bar_content_translation_ !=
-          frame.metadata.location_bar_content_translation ||
+      top_bar_shown_ != frame.metadata.top_bar_shown ||
       current_viewport_selection_ != frame.metadata.selection) {
     RemoveLayers();
     if (!surface_id_.is_null())
@@ -1015,8 +1022,7 @@ void RenderWidgetHostViewAndroid::SubmitCompositorFrame(
     DCHECK(layer_);
 
     current_surface_size_ = texture_size_in_layer_;
-    location_bar_content_translation_ =
-        frame.metadata.location_bar_content_translation;
+    top_bar_shown_ = frame.metadata.top_bar_shown;
     current_viewport_selection_ = frame.metadata.selection;
     AttachLayers();
   }
@@ -1285,10 +1291,9 @@ void RenderWidgetHostViewAndroid::OnFrameMetadataUpdated(
     // Set parameters for adaptive handle orientation.
     gfx::SizeF viewport_size(frame_metadata.scrollable_viewport_size);
     viewport_size.Scale(frame_metadata.page_scale_factor);
-    gfx::RectF viewport_rect(
-        frame_metadata.location_bar_content_translation.x(),
-        frame_metadata.location_bar_content_translation.y(),
-        viewport_size.width(), viewport_size.height());
+    gfx::RectF viewport_rect(frame_metadata.top_bar_shown.x(),
+                             frame_metadata.top_bar_shown.y(),
+                             viewport_size.width(), viewport_size.height());
     selection_controller_->OnViewportChanged(viewport_rect);
   }
 
@@ -1302,8 +1307,10 @@ void RenderWidgetHostViewAndroid::OnFrameMetadataUpdated(
                      frame_metadata.max_page_scale_factor),
       frame_metadata.root_layer_size,
       frame_metadata.scrollable_viewport_size,
-      frame_metadata.location_bar_offset,
-      frame_metadata.location_bar_content_translation,
+      frame_metadata.top_bar_translate,
+      frame_metadata.top_bar_shown,
+      frame_metadata.bottom_bar_translate,
+      frame_metadata.bottom_bar_shown,
       is_mobile_optimized,
       frame_metadata.selection.start);
 #if defined(VIDEO_HOLE)