Add desired width & height to drawContext (as opposed to using the width & height of the RT)

src/gpu/SkGpuDevice.h

Index: src/gpu/SkGpuDevice.h
diff --git a/src/gpu/SkGpuDevice.h b/src/gpu/SkGpuDevice.h
index b72e917a375bd1b9efa3c98b3f48b247bac95048..957f61eaf2c02af1a04f135a958434ba4a5cc824 100644
--- a/src/gpu/SkGpuDevice.h
+++ b/src/gpu/SkGpuDevice.h
@@ -42,7 +42,8 @@ public:
      *       MakeFromBackendTexture, MakeFromBackendRenderTarget,
      *       and MakeFromBackendTextureAsRenderTarget. Only the first is worrisome.
      */
-    static sk_sp<SkGpuDevice> Make(sk_sp<GrRenderTarget> target, 
+    static sk_sp<SkGpuDevice> Make(int width, int height,
+                                   sk_sp<GrRenderTarget> target, 
                                    const SkSurfaceProps*,
                                    InitContents);
 
@@ -50,9 +51,7 @@ public:
      * Creates an SkGpuDevice from a GrDrawContext whose backing width/height is
      * different than its actual width/height (e.g., approx-match scratch texture).
      */
-    static sk_sp<SkBaseDevice> Make(sk_sp<GrDrawContext> drawContext,
-                                    int width, int height,
-                                    InitContents);
+    static sk_sp<SkBaseDevice> Make(sk_sp<GrDrawContext> drawContext, InitContents);
 
     /**
      * New device that will create an offscreen renderTarget based on the ImageInfo and
@@ -173,7 +172,7 @@ private:
     static bool CheckAlphaTypeAndGetFlags(const SkImageInfo* info, InitContents init,
                                           unsigned* flags);
 
-    SkGpuDevice(sk_sp<GrDrawContext>, int width, int height, unsigned flags);
+    SkGpuDevice(sk_sp<GrDrawContext>, unsigned flags);
 
     SkBaseDevice* onCreateDevice(const CreateInfo&, const SkPaint*) override;