Make Gr clear take a rect for a partial-clear

Review URL: http://codereview.appspot.com/4442093/



git-svn-id: http://skia.googlecode.com/svn/trunk@1203 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/src/GrGpu.cpp b/gpu/src/GrGpu.cpp
index c05a04a..cb78204 100644
--- a/gpu/src/GrGpu.cpp
+++ b/gpu/src/GrGpu.cpp
@@ -173,9 +173,9 @@
     return this->onCreateIndexBuffer(size, dynamic);
 }
 
-void GrGpu::clear(GrColor color) {
+void GrGpu::clear(const GrIRect* rect, GrColor color) {
     this->handleDirtyContext();
-    this->onClear(color);
+    this->onClear(rect, color);
 }
 
 void GrGpu::forceRenderTargetFlush() {