Force checking of all color, stencil and FBO allocations for SkSurface_Gpu. This fixes the software…

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 687ca6c5ba7feec5854a7d833855cf02e7c08a47..154f1793f05089784a603e449b3f868c7fe76212 100644
--- a/src/image/SkSurface_Gpu.cpp
+++ b/src/image/SkSurface_Gpu.cpp
@@ -126,7 +126,7 @@ SkSurface* SkSurface::NewRenderTarget(GrContext* ctx, const SkImage::Info& info,
     SkBitmap::Config config = SkImageInfoToBitmapConfig(info, &isOpaque);
 
     GrTextureDesc desc;
-    desc.fFlags = kRenderTarget_GrTextureFlagBit;
+    desc.fFlags = kRenderTarget_GrTextureFlagBit | kCheckAllocation_GrTextureFlagBit;
     desc.fWidth = info.fWidth;
     desc.fHeight = info.fHeight;
     desc.fConfig = SkBitmapConfig2GrPixelConfig(config);