Route selection bounds updates through the compositor

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 dac39c7205f3b9e43634c0cb47eb5f2841c704fc..65525a92eafb0a2b4d7df2925e9dea4b959a51e6 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -189,6 +189,8 @@ RenderWidgetHostViewAndroid::RenderWidgetHostViewAndroid(
       gesture_provider_(CreateGestureProviderConfig(), this),
       flush_input_requested_(false),
       accelerated_surface_route_id_(0),
+      cached_selection_anchor_visible_(false),
+      cached_selection_focus_visible_(false),
       using_synchronous_compositor_(SynchronousCompositorImpl::FromID(
                                         widget_host->GetProcess()->GetID(),
                                         widget_host->GetRoutingID()) != NULL),
@@ -635,9 +637,29 @@ void RenderWidgetHostViewAndroid::SelectionChanged(const base::string16& text,
 
 void RenderWidgetHostViewAndroid::SelectionBoundsChanged(
     const ViewHostMsg_SelectionBounds_Params& params) {
-  if (content_view_core_) {
-    content_view_core_->OnSelectionBoundsChanged(params);
-  }
+  if (!content_view_core_)
+    return;
+
+  const gfx::PointF anchor = params.anchor_rect.bottom_left();
+  const gfx::PointF focus = params.focus_rect.bottom_left();
+
+  if (cached_selection_anchor_ == anchor && cached_selection_focus_ == focus &&
+      cached_selection_anchor_visible_ == params.is_anchor_visible &&
+      cached_selection_focus_visible_ == params.is_focus_visible)
+    return;
+
+  cached_selection_anchor_ = anchor;
+  cached_selection_focus_ = focus;
+  cached_selection_anchor_visible_ = params.is_anchor_visible;
+  cached_selection_focus_visible_ = params.is_focus_visible;
+
+  content_view_core_->OnSelectionBoundsChanged(anchor,
+                                               focus,
+                                               params.anchor_dir,
+                                               params.focus_dir,
+                                               params.is_anchor_first,
+                                               params.is_anchor_visible,
+                                               params.is_focus_visible);
 }
 
 void RenderWidgetHostViewAndroid::ScrollOffsetChanged() {