Remove top and bottom margins from TrayBubbleView

ui/compositor/layer.cc

Index: ui/compositor/layer.cc
diff --git a/ui/compositor/layer.cc b/ui/compositor/layer.cc
index 2a88db500fe5b74141d8dddd174b02b8638ba6b6..c3ddc84a46718c3089fda7c46f5ef784a8b8dcdd 100644
--- a/ui/compositor/layer.cc
+++ b/ui/compositor/layer.cc
@@ -295,8 +295,10 @@ void Layer::SetMaskLayer(Layer* layer_mask) {
       layer_mask ? layer_mask->web_layer() : NULL);
   // We need to reference the linked object so that it can properly break the
   // link to us when it gets deleted.
-  if (layer_mask)
+  if (layer_mask) {
     layer_mask->layer_mask_back_link_ = this;
+    layer_mask->OnDeviceScaleFactorChanged(device_scale_factor_);
+  }
 }
 
 void Layer::SetLayerFilters() {
@@ -491,6 +493,8 @@ void Layer::OnDeviceScaleFactorChanged(float device_scale_factor) {
     delegate_->OnDeviceScaleFactorChanged(device_scale_factor);
   for (size_t i = 0; i < children_.size(); ++i)
     children_[i]->OnDeviceScaleFactorChanged(device_scale_factor);
+  if (layer_mask_)
+    layer_mask_->OnDeviceScaleFactorChanged(device_scale_factor);
 }
 
 void Layer::paintContents(WebKit::WebCanvas* web_canvas,