Move some work from backend onClear to base class clear

src/gpu/GrBufferedDrawTarget.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrBufferedDrawTarget.h"
 
 // We will use the reordering buffer, unless we have NVPR.
@@ skipping 62 matching lines @@
     if (!state) {
         return;
     }
     GrTargetCommands::Cmd* cmd = fCommands->recordDrawPaths(state, this, pathProc, pathRange,
                                                             indices, indexType, transformValues,
                                                             transformType, count,
                                                             stencilSettings, pipelineInfo);
     this->recordTraceMarkersIfNecessary(cmd);
 }
 
-void GrBufferedDrawTarget::onClear(const SkIRect* rect, GrColor color,
-                                  bool canIgnoreRect, GrRenderTarget* renderTarget) {
-    GrTargetCommands::Cmd* cmd = fCommands->recordClear(rect, color, canIgnoreRect, renderTarget);
+void GrBufferedDrawTarget::onClear(const SkIRect& rect, GrColor color,
+                                   GrRenderTarget* renderTarget) {
+    GrTargetCommands::Cmd* cmd = fCommands->recordClear(rect, color, renderTarget);
     this->recordTraceMarkersIfNecessary(cmd);
 }
 
 void GrBufferedDrawTarget::clearStencilClip(const SkIRect& rect,
                                             bool insideClip,
                                             GrRenderTarget* renderTarget) {
     GrTargetCommands::Cmd* cmd = fCommands->recordClearStencilClip(rect, insideClip, renderTarget);
     this->recordTraceMarkersIfNecessary(cmd);
 }
 
@@ skipping 96 matching lines @@
         fPrevState->getPipeline()->isEqual(*state->getPipeline())) {
         this->unallocState(state);
     } else {
         fPrevState.reset(state);
     }
 
     this->recordTraceMarkersIfNecessary(
             fCommands->recordXferBarrierIfNecessary(*fPrevState->getPipeline(), *this->caps()));
     return fPrevState;
 }