Remove uses of GrAutoScratchTexture.

src/gpu/GrRenderTarget.cpp

Index: src/gpu/GrRenderTarget.cpp
diff --git a/src/gpu/GrRenderTarget.cpp b/src/gpu/GrRenderTarget.cpp
index b9763325d89b6363e67dfcc486099ea64fd98121..4f6d87735b770a352961d5588c0b4c2928659149 100644
--- a/src/gpu/GrRenderTarget.cpp
+++ b/src/gpu/GrRenderTarget.cpp
@@ -29,7 +29,7 @@ bool GrRenderTarget::readPixels(int left, int top, int width, int height,
                                            pixelOpsFlags);
 }
 
-void GrRenderTarget::writePixels(int left, int top, int width, int height,
+bool GrRenderTarget::writePixels(int left, int top, int width, int height,
                                  GrPixelConfig config,
                                  const void* buffer,
                                  size_t rowBytes,
@@ -37,12 +37,12 @@ void GrRenderTarget::writePixels(int left, int top, int width, int height,
     // go through context so that all necessary flushing occurs
     GrContext* context = this->getContext();
     if (NULL == context) {
-        return;
+        return false;
     }
-    context->writeRenderTargetPixels(this,
-                                     left, top, width, height,
-                                     config, buffer, rowBytes,
-                                     pixelOpsFlags);
+    return context->writeRenderTargetPixels(this,
+                                            left, top, width, height,
+                                            config, buffer, rowBytes,
+                                            pixelOpsFlags);
 }
 
 void GrRenderTarget::resolve() {