Introduce bottom controls to CC and let it respond to scrolling

content/browser/renderer_host/render_widget_host_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 
 #include <math.h>
 
 #include <set>
 #include <tuple>
@@ skipping 577 matching lines @@
     resize_params->is_fullscreen_granted = false;
     resize_params->display_mode = blink::WebDisplayModeBrowser;
   }
 
   if (view_) {
     resize_params->new_size = view_->GetRequestedRendererSize();
     resize_params->physical_backing_size = view_->GetPhysicalBackingSize();
     resize_params->top_controls_height = view_->GetTopControlsHeight();
     resize_params->top_controls_shrink_blink_size =
         view_->DoTopControlsShrinkBlinkSize();
+    resize_params->bottom_controls_height = view_->GetBottomControlsHeight();
     resize_params->visible_viewport_size = view_->GetVisibleViewportSize();
   }
 
   const bool size_changed =
       !old_resize_params_ ||
       old_resize_params_->new_size != resize_params->new_size ||
       (old_resize_params_->physical_backing_size.IsEmpty() &&
        !resize_params->physical_backing_size.IsEmpty());
   bool dirty = size_changed ||
       old_resize_params_->screen_info != resize_params->screen_info ||
       old_resize_params_->physical_backing_size !=
           resize_params->physical_backing_size ||
       old_resize_params_->is_fullscreen_granted !=
           resize_params->is_fullscreen_granted ||
       old_resize_params_->display_mode != resize_params->display_mode ||
       old_resize_params_->top_controls_height !=
           resize_params->top_controls_height ||
       old_resize_params_->top_controls_shrink_blink_size !=
           resize_params->top_controls_shrink_blink_size ||
+      old_resize_params_->bottom_controls_height !=
+          resize_params->bottom_controls_height ||
       old_resize_params_->visible_viewport_size !=
           resize_params->visible_viewport_size;
 
   // We don't expect to receive an ACK when the requested size or the physical
   // backing size is empty, or when the main viewport size didn't change.
   resize_params->needs_resize_ack =
       g_check_for_pending_resize_ack && !resize_params->new_size.IsEmpty() &&
       !resize_params->physical_backing_size.IsEmpty() && size_changed;
 
   return dirty;
@@ skipping 1539 matching lines @@
   return delegate_ ? delegate_->GetRootBrowserAccessibilityManager() : NULL;
 }
 
 BrowserAccessibilityManager*
     RenderWidgetHostImpl::GetOrCreateRootBrowserAccessibilityManager() {
   return delegate_ ?
       delegate_->GetOrCreateRootBrowserAccessibilityManager() : NULL;
 }
 
 }  // namespace content