Snap layers in views to physical pixel

ui/compositor/debug_utils.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.
 
 #define _USE_MATH_DEFINES // For VC++ to get M_PI. This has to be first.
 
 #include "ui/compositor/debug_utils.h"
 
 #include <cmath>
 #include <iomanip>
@@ skipping 46 matching lines @@
       break;
   }
 
   if (!layer->visible())
     *out << L" !visible";
 
   std::string property_indent_str(indent+3, ' ');
   *out << L'\n' << UTF8ToWide(property_indent_str);
   *out << L"bounds: " << layer->bounds().x() << L',' << layer->bounds().y();
   *out << L' ' << layer->bounds().width() << L'x' << layer->bounds().height();
+  if (!layer->subpixel_position_offset().IsZero())
+    *out << " " << UTF8ToWide(layer->subpixel_position_offset().ToString());
+
+  const ui::Layer* mask = const_cast<ui::Layer*>(layer)->layer_mask_layer();
+
+  if (mask) {
+    *out << L'\n' << UTF8ToWide(property_indent_str);
+    *out << L"mask layer: " << std::setprecision(2)
+         << UTF8ToWide(mask->bounds().ToString())
+         << UTF8ToWide(mask->subpixel_position_offset().ToString());
+  }
 
   if (layer->opacity() != 1.0f) {
     *out << L'\n' << UTF8ToWide(property_indent_str);
     *out << L"opacity: " << std::setprecision(2) << layer->opacity();
   }
 
   gfx::DecomposedTransform decomp;
   if (!layer->transform().IsIdentity() &&
       gfx::DecomposeTransform(&decomp, layer->transform())) {
     *out << L'\n' << UTF8ToWide(property_indent_str);
@@ skipping 21 matching lines @@
 
 void PrintLayerHierarchy(const Layer* layer, gfx::Point mouse_location) {
   std::wostringstream out;
   out << L"Layer hierarchy:\n";
   PrintLayerHierarchyImp(layer, 0, mouse_location, &out);
   // Error so logs can be collected from end-users.
   LOG(ERROR) << out.str();
 }
 
 }  // namespace ui