Convert SkMatrix::I() assignments to SkMatrix::reset() calls



git-svn-id: http://skia.googlecode.com/svn/trunk@3441 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrGpu.cpp b/src/gpu/GrGpu.cpp
index 32338ca..10c5c44 100644
--- a/src/gpu/GrGpu.cpp
+++ b/src/gpu/GrGpu.cpp
@@ -594,7 +594,7 @@
             AutoStateRestore asr(this);
             AutoGeometryPush agp(this);
 
-            drawState->setViewMatrix(GrMatrix::I());
+            drawState->viewMatrix()->reset();
             this->flushScissor(NULL);
 #if !VISUALIZE_COMPLEX_CLIP
             drawState->enableState(GrDrawState::kNoColorWrites_StateBit);