Turn on conservative raster clip for GPU canvases

src/image/SkSurface_Gpu.cpp

Index: src/image/SkSurface_Gpu.cpp
diff --git a/src/image/SkSurface_Gpu.cpp b/src/image/SkSurface_Gpu.cpp
index 2d5645b2b016d734b2c170881b8e7b276182d6ba..753f422e79b4815616e5b10caa1e621b5a3d0ef0 100644
--- a/src/image/SkSurface_Gpu.cpp
+++ b/src/image/SkSurface_Gpu.cpp
@@ -62,8 +62,7 @@ bool SkSurface_Gpu::onGetRenderTargetHandle(GrBackendObject* obj, BackendHandleA
 
 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);
 }