Fix main thread top controls scrolling to mirror CC.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 75cc2fb5cbe3015ef1a4ecd215cde43cae31906a..ff68188bb92d157e10a75c3abb4ebfd595d902db 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -627,6 +627,8 @@ RenderViewImpl::RenderViewImpl(CompositorDependencies* compositor_deps,
 #if defined(OS_ANDROID)
       top_controls_constraints_(TOP_CONTROLS_STATE_BOTH),
 #endif
+      top_controls_shrink_blink_size_(false),
+      top_controls_height_(0.f),
       has_focus_(false),
       has_scrolled_focused_editable_node_into_rect_(false),
       main_render_frame_(nullptr),
@@ -2598,6 +2600,12 @@ void RenderViewImpl::OnMoveOrResizeStarted() {
     webview()->hidePopups();
 }
 
+void RenderViewImpl::ResizeWebWidget(const gfx::Size& new_size, bool) {
+    webview()->resizeWithTopControls(new_size,

[bokan, 2016/04/11 19:54:15]

This method will early out if the parameters are unchanged so that's why I
ignore the `resized` param here. Some of the overrides of WebWidget::resize
don't early out so I kept it in RenderWidget::ResizeWebWidget but maybe that's
unnecessary as well?

+                                     top_controls_height_,
+                                     top_controls_shrink_blink_size_);
+}
+
 void RenderViewImpl::OnResize(const ResizeParams& params) {
   TRACE_EVENT0("renderer", "RenderViewImpl::OnResize");
   if (webview()) {
@@ -2615,6 +2623,9 @@ void RenderViewImpl::OnResize(const ResizeParams& params) {
 
   gfx::Size old_visible_viewport_size = visible_viewport_size_;
 
+  top_controls_shrink_blink_size_ = params.top_controls_shrink_blink_size;
+  top_controls_height_ = params.top_controls_height;
+
   RenderWidget::OnResize(params);
 
   if (old_visible_viewport_size != visible_viewport_size_)