remove view matrix from context

src/core/SkImageFilter.cpp

Index: src/core/SkImageFilter.cpp
diff --git a/src/core/SkImageFilter.cpp b/src/core/SkImageFilter.cpp
index b6f8b55a164164b1832653b258a4fecf56643192..9366ebafa8169ba1c6ef5dbef16fa39a6e9da826 100644
--- a/src/core/SkImageFilter.cpp
+++ b/src/core/SkImageFilter.cpp
@@ -256,8 +256,6 @@ bool SkImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, const Cont
     if (!dst) {
         return false;
     }
-    GrContext::AutoMatrix am;
-    am.setIdentity(context);
     GrContext::AutoRenderTarget art(context, dst->asRenderTarget());
     GrContext::AutoClip acs(context, dstRect);
     GrFragmentProcessor* fp;
@@ -270,7 +268,7 @@ bool SkImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, const Cont
         SkASSERT(fp);
         GrPaint paint;
         paint.addColorProcessor(fp)->unref();
-        context->drawRectToRect(paint, dstRect, srcRect);
+        context->drawRectToRect(paint, SkMatrix::I(), dstRect, srcRect);
 
         WrapTexture(dst, bounds.width(), bounds.height(), result);
         return true;