cc: Translate the canvas to correctly detect solid colors

cc/resources/picture_pile_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <map>
 #include <utility>
 
 #include "cc/resources/picture_pile.h"
 #include "cc/test/fake_content_layer_client.h"
 #include "cc/test/fake_rendering_stats_instrumentation.h"
@@ skipping 1414 matching lines @@
   client_.add_draw_rect(tiling_rect(), paint);
   client_.add_draw_rect(tiling_rect(), paint);
   client_.add_draw_rect(tiling_rect(), paint);
   client_.add_draw_rect(tiling_rect(), paint);
   client_.add_draw_rect(tiling_rect(), paint);
   Region invalidation5(tiling_rect());
   UpdateAndExpandInvalidation(&invalidation5, tiling_size(), tiling_rect());
   EXPECT_FALSE(pile_.is_solid_color());
 }
 
+TEST_F(PicturePileTest, NonSolidRectangleOnOffsetedLayerIsNonSolid) {

[vmpstr, 2014/10/29 21:41:58]

Offset?

+  gfx::Rect tiling_rect(tiling_rect());
+  tiling_rect.Offset(gfx::Vector2d(10000, 0));
+  gfx::Size tiling_size(tiling_rect.x() + tiling_rect.width(),

[vmpstr, 2014/10/29 21:41:59]

right, bottom? Also, why is the tiling size bigger than tiling_rect.size()?

+                        tiling_rect.y() + tiling_rect.height());
+  // |Setup()| will create pictures here that mess with the test, clear it!
+  pile_.Clear();
+
+  SkPaint paint;
+  paint.setColor(SK_ColorCYAN);
+
+  // Add a rect that doesn't cover the viewport completely, the solid state
+  // will be false.
+  gfx::Rect smallRect = tiling_rect;
+  smallRect.Inset(10, 10, 10, 10);
+  client_.add_draw_rect(smallRect, paint);
+  Region invalidation2(tiling_rect);

[vmpstr, 2014/10/29 21:41:59]

just invalidation.

+  UpdateAndExpandInvalidation(&invalidation2, tiling_size, tiling_rect);
+  EXPECT_FALSE(pile_.is_solid_color());
+}
+
 }  // namespace
 }  // namespace cc