Mac Overlays: Allow SolidColor and Tile quads to be candidates for overlays.

cc/resources/resource_provider.h

Index: cc/resources/resource_provider.h
diff --git a/cc/resources/resource_provider.h b/cc/resources/resource_provider.h
index 4af135eab57613d1070f77558020606222b00357..5b2b88ae6bfa5575e4c6dbc516b43b68e93bf7ee 100644
--- a/cc/resources/resource_provider.h
+++ b/cc/resources/resource_provider.h
@@ -311,6 +311,22 @@ class CC_EXPORT ResourceProvider
     DISALLOW_COPY_AND_ASSIGN(ScopedWriteLockSoftware);
   };
 
+  class CC_EXPORT ScopedReadLockGpuMemoryBuffer {
+   public:
+    ScopedReadLockGpuMemoryBuffer(ResourceProvider* resource_provider,
+                                  ResourceId resource_id);
+    ~ScopedReadLockGpuMemoryBuffer();
+
+    unsigned image_id() const { return image_id_; }
+
+   private:
+    ResourceProvider* resource_provider_;
+    ResourceId resource_id_;
+    unsigned image_id_;
+
+    DISALLOW_COPY_AND_ASSIGN(ScopedReadLockGpuMemoryBuffer);
+  };
+
   class CC_EXPORT ScopedWriteLockGpuMemoryBuffer {
    public:
     ScopedWriteLockGpuMemoryBuffer(ResourceProvider* resource_provider,