Add resource provider flag to avoid client-side buffers

src/gpu/GrGpu.h

Index: src/gpu/GrGpu.h
diff --git a/src/gpu/GrGpu.h b/src/gpu/GrGpu.h
index be8a59a738098045c0417a4834bff15e1e648ec7..dce41fd4c28aef1c49a6ab639f0d093068ddf80c 100644
--- a/src/gpu/GrGpu.h
+++ b/src/gpu/GrGpu.h
@@ -137,7 +137,7 @@ public:
     GrRenderTarget* wrapBackendTextureAsRenderTarget(const GrBackendTextureDesc&);
 
     /**
-     * Creates a buffer.
+     * Creates a buffer in GPU memory. For a client-side buffer use GrBuffer::CreateCPUBacked.
      *
      * @param size            size of buffer to create.
      * @param intendedType    hint to the graphics subsystem about what the buffer will be used for.