Make morphology, convolution, and table color filter opt out of default texture matrices.
Review URL: https://codereview.appspot.com/6817077

git-svn-id: http://skia.googlecode.com/svn/trunk@6280 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index 2ad5cf8..ceb37cd 100644
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -199,12 +199,10 @@
     GrDrawTarget::AutoStateRestore asr(target, GrDrawTarget::kReset_ASRInit);
     GrDrawState* drawState = target->drawState();
     drawState->setRenderTarget(rt);
-    SkMatrix sampleM;
-    sampleM.setIDiv(texture->width(), texture->height());
     SkAutoTUnref<GrConvolutionEffect> conv(SkNEW_ARGS(GrConvolutionEffect,
                                                       (texture, direction, radius,
                                                        sigma)));
-    drawState->stage(0)->setEffect(conv, sampleM);
+    drawState->stage(0)->setEffect(conv);
     target->drawSimpleRect(rect, NULL);
 }