Add CompositingReasons to compositor layer types.

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index 82548ba66bcc35adab1abc4c6bb88d8aeb4ea9c1..7caab6e9ef46d997454466d5f11f4f11e26079d3 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -22,6 +22,7 @@
 #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"
@@ -287,6 +288,7 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
   virtual void SetIsMask(bool is_mask) {}
 
   void SetDebugName(const std::string& debug_name);
+  void SetCompositingReasons(WebKit::WebCompositingReasons reasons);
 
   virtual void PushPropertiesTo(LayerImpl* layer);
 
@@ -452,6 +454,7 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
   gfx::PointF anchor_point_;
   SkColor background_color_;
   std::string debug_name_;
+  WebKit::WebCompositingReasons compositing_reasons_;
   float opacity_;
   skia::RefPtr<SkImageFilter> filter_;
   WebKit::WebFilterOperations filters_;