Change clear() to respect the clip

src/image/SkSurface_Gpu.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkSurface_Base.h"
 #include "SkImagePriv.h"
 #include "SkImage_Base.h"
@@ skipping 26 matching lines @@
 ///////////////////////////////////////////////////////////////////////////////
 
 SkSurface_Gpu::SkSurface_Gpu(GrRenderTarget* renderTarget, const SkSurfaceProps* props,
                              bool doClear)
         : INHERITED(renderTarget->width(), renderTarget->height(), props) {
     int deviceFlags = 0;
     deviceFlags |= this->props().isUseDistanceFieldFonts() ? SkGpuDevice::kDFText_Flag : 0;
     fDevice = SkGpuDevice::Create(renderTarget, this->props(), deviceFlags);
 
     if (kRGB_565_GrPixelConfig != renderTarget->config() && doClear) {
-        fDevice->clear(0x0);
+        fDevice->clearAll();
     }
 }
 
 SkSurface_Gpu::~SkSurface_Gpu() {
     SkSafeUnref(fDevice);
 }
 
 SkCanvas* SkSurface_Gpu::onNewCanvas() {
     SkCanvas::InitFlags flags = SkCanvas::kDefault_InitFlags;
     // When we think this works...
@@ skipping 98 matching lines @@
     SkAutoTUnref<GrTexture> tex(ctx->refScratchTexture(desc, GrContext::kExact_ScratchTexMatch));
 
     if (NULL == tex) {
         return NULL;
     }
 
     return SkNEW_ARGS(SkSurface_Gpu, (tex->asRenderTarget(), props, true));
 }
 
 #endif