Add CompositingReasons to compositor layer types.

cc/layers/layer.h

 // Copyright 2010 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.
 
 #ifndef CC_LAYERS_LAYER_H_
 #define CC_LAYERS_LAYER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
 #include "cc/animation/layer_animation_controller.h"
 #include "cc/animation/layer_animation_value_observer.h"
 #include "cc/base/cc_export.h"
 #include "cc/base/region.h"
 #include "cc/layers/draw_properties.h"
 #include "cc/layers/layer_lists.h"
 #include "cc/layers/layer_position_constraint.h"
 #include "cc/layers/paint_properties.h"
 #include "cc/layers/render_surface.h"
 #include "cc/trees/occlusion_tracker.h"
 #include "skia/ext/refptr.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebCompositingReasons.h"

[danakj, 2013/05/15 14:02:43]

Can we avoid adding new WebKit headers in cc? AIUI We're trying to remove them
all.

[enne (OOO), 2013/05/15 15:51:51]

+1000

You'll need to add a parallel enum structure, some compile asserts, and
static_casts.  Here's an existing example:
https://code.google.com/p/chromium/codesearch#chromium/src/webkit/compositor_...

 #include "third_party/WebKit/Source/Platform/chromium/public/WebFilterOperations.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkImageFilter.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/rect_f.h"
 #include "ui/gfx/transform.h"
 
 namespace WebKit {
 class WebAnimationDelegate;
 class WebLayerScrollClient;
@@ skipping 245 matching lines @@
   // These methods typically need to be overwritten by derived classes.
   virtual bool DrawsContent() const;
   virtual void SavePaintProperties();
   virtual void Update(ResourceUpdateQueue* queue,
                       const OcclusionTracker* occlusion,
                       RenderingStats* stats) {}
   virtual bool NeedMoreUpdates();
   virtual void SetIsMask(bool is_mask) {}
 
   void SetDebugName(const std::string& debug_name);
+  void SetCompositingReasons(WebKit::WebCompositingReasons reasons);
 
   virtual void PushPropertiesTo(LayerImpl* layer);
 
   void CreateRenderSurface();
   void ClearRenderSurface();
 
   // The contents scale converts from logical, non-page-scaled pixels to target
   // pixels. The contents scale is 1 for the root layer as it is already in
   // physical pixels. By default contents scale is forced to be 1 except for
   // subclasses of ContentsScalingLayer.
@@ skipping 145 matching lines @@
   gfx::Vector2d max_scroll_offset_;
   bool scrollable_;
   bool should_scroll_on_main_thread_;
   bool have_wheel_event_handlers_;
   Region non_fast_scrollable_region_;
   Region touch_event_handler_region_;
   gfx::PointF position_;
   gfx::PointF anchor_point_;
   SkColor background_color_;
   std::string debug_name_;
+  WebKit::WebCompositingReasons compositing_reasons_;
   float opacity_;
   skia::RefPtr<SkImageFilter> filter_;
   WebKit::WebFilterOperations filters_;
   WebKit::WebFilterOperations background_filters_;
   float anchor_point_z_;
   bool is_container_for_fixed_position_layers_;
   LayerPositionConstraint position_constraint_;
   bool is_drawable_;
   bool masks_to_bounds_;
   bool contents_opaque_;
@@ skipping 19 matching lines @@
   DrawProperties<Layer, RenderSurface> draw_properties_;
 
   PaintProperties paint_properties_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_H_