Adding a new SkSurface factory for generating surfaces from the scratch texture pool.

include/gpu/GrContext.h

Index: include/gpu/GrContext.h
diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index 1834586578281fc6fcea3a02e7f4909bfb0f69c5..52a25b452796b87740eedcb094e1517189af5bad 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -111,6 +111,11 @@ public:
      */
     size_t getGpuTextureCacheBytes() const;
 
+    /**
+     * Returns the number of resources hosted by the texture cache.
+     */
+    int getGpuTextureCacheResourceCount() const;
+
     ///////////////////////////////////////////////////////////////////////////
     // Textures