Change clear() to respect the clip

tests/DeferredCanvasTest.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "../src/image/SkImagePriv.h"
 #include "../src/image/SkSurface_Base.h"
 #include "SkBitmap.h"
@@ skipping 266 matching lines @@
     canvas->clear(0x00000000);
     canvas->restore();
     REPORTER_ASSERT(reporter, canvas->isFreshFrame());
 
     // Verify that clear within a layer does NOT trigger a fresh frame
     canvas->saveLayer(NULL, NULL);
     canvas->clear(0x00000000);
     canvas->restore();
     REPORTER_ASSERT(reporter, !canvas->isFreshFrame());
 
-    // Verify that a clear with clipping triggers a fresh frame
-    // (clear is not affected by clipping)
-    canvas->save();
-    canvas->clipRect(partialRect, SkRegion::kIntersect_Op, false);
-    canvas->clear(0x00000000);
-    canvas->restore();
-    REPORTER_ASSERT(reporter, canvas->isFreshFrame());
-
     // Verify that full frame rects with different forms of opaque paint
     // trigger frames to be marked as fresh
     {
         SkPaint paint;
         paint.setStyle(SkPaint::kFill_Style);
         paint.setAlpha(255);
         canvas->drawRect(fullRect, paint);
         REPORTER_ASSERT(reporter, canvas->isFreshFrame());
     }
     {
@@ skipping 602 matching lines @@
     TestDeferredCanvasSurface(reporter, NULL);
     TestDeferredCanvasSetSurface(reporter, NULL);
 }
 
 DEF_GPUTEST(DeferredCanvas_GPU, reporter, factory) {
     if (factory != NULL) {
         TestDeferredCanvasSurface(reporter, factory);
         TestDeferredCanvasSetSurface(reporter, factory);
     }
 }