Add sizeInBytes to GrResource, make GrRenderTarget aware of its pixel config

Review URL: http://codereview.appspot.com/4802058/



git-svn-id: http://skia.googlecode.com/svn/trunk@1951 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/include/GrIndexBuffer.h b/gpu/include/GrIndexBuffer.h
index 366640e..23078c3 100644
--- a/gpu/include/GrIndexBuffer.h
+++ b/gpu/include/GrIndexBuffer.h
@@ -27,7 +27,9 @@
          * from the index buffer (using kTriangles_PrimitiveType).
          * @return the maximum number of quads using full size of index buffer.
          */
-        int maxQuads() const { return size() / (sizeof(uint16_t) * 6); }
+        int maxQuads() const {
+            return this->sizeInBytes() / (sizeof(uint16_t) * 6);
+        }
 protected:
     GrIndexBuffer(GrGpu* gpu, size_t sizeInBytes, bool dynamic)
         : INHERITED(gpu, sizeInBytes, dynamic) {}