Turn on conservative raster clip for GPU canvases

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_Gpu.h"
 
 #include "SkCanvas.h"
@@ skipping 44 matching lines @@
 }
 
 bool SkSurface_Gpu::onGetRenderTargetHandle(GrBackendObject* obj, BackendHandleAccess access) {
     GrRenderTarget* rt = prepare_rt_for_external_access(this, access);
     *obj = rt->getRenderTargetHandle();
     return true;
 }
 
 SkCanvas* SkSurface_Gpu::onNewCanvas() {
     SkCanvas::InitFlags flags = SkCanvas::kDefault_InitFlags;
-    // When we think this works...
-//    flags |= SkCanvas::kConservativeRasterClip_InitFlag;
+    flags = static_cast<SkCanvas::InitFlags>(flags | SkCanvas::kConservativeRasterClip_InitFlag);
 
     return new SkCanvas(fDevice, flags);
 }
 
 SkSurface* SkSurface_Gpu::onNewSurface(const SkImageInfo& info) {
     GrRenderTarget* rt = fDevice->accessRenderTarget();
     int sampleCount = rt->numColorSamples();
     // TODO: Make caller specify this (change virtual signature of onNewSurface).
     static const Budgeted kBudgeted = kNo_Budgeted;
     return SkSurface::NewRenderTarget(fDevice->context(), kBudgeted, info, sampleCount,
@@ skipping 86 matching lines @@
     }
     SkAutoTUnref<SkGpuDevice> device(SkGpuDevice::Create(rt, props,
                                                          SkGpuDevice::kUninit_InitContents));
     if (!device) {
         return nullptr;
     }
     return new SkSurface_Gpu(device);
 }
 
 #endif