Add can-ignore-rect hint to clear call

https://codereview.chromium.org/53823003/



git-svn-id: http://skia.googlecode.com/svn/trunk@12064 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrGpu.cpp b/src/gpu/GrGpu.cpp
index cd217f4..af7037a 100644
--- a/src/gpu/GrGpu.cpp
+++ b/src/gpu/GrGpu.cpp
@@ -205,6 +205,7 @@
 
 void GrGpu::clear(const SkIRect* rect,
                   GrColor color,
+                  bool canIgnoreRect,
                   GrRenderTarget* renderTarget) {
     GrDrawState::AutoRenderTargetRestore art;
     if (NULL != renderTarget) {
@@ -215,7 +216,7 @@
         return;
     }
     this->handleDirtyContext();
-    this->onClear(rect, color);
+    this->onClear(rect, color, canIgnoreRect);
 }
 
 void GrGpu::forceRenderTargetFlush() {