Remove uses of GrAutoScratchTexture.

include/gpu/GrSurface.h

Index: include/gpu/GrSurface.h
diff --git a/include/gpu/GrSurface.h b/include/gpu/GrSurface.h
index 0bbf8d9c12a0ee4eac5fcc7de6c57b2057a02e7d..e47cf36a6e8d6da8924b84c1652a1c79c1c66acc 100644
--- a/include/gpu/GrSurface.h
+++ b/include/gpu/GrSurface.h
@@ -105,8 +105,11 @@ public:
      * @param rowBytes      number of bytes between consecutive rows. Zero means rows are tightly
      *                      packed.
      * @param pixelOpsFlags See the GrContext::PixelOpsFlags enum.
+     *
+     * @return true if the read succeeded, false if not. The read can fail because of an unsupported
+     *              pixel config.
      */
-    virtual void writePixels(int left, int top, int width, int height,
+    virtual bool writePixels(int left, int top, int width, int height,
                              GrPixelConfig config,
                              const void* buffer,
                              size_t rowBytes = 0,