cc: Translate the canvas to correctly detect solid colors

cc/resources/picture_pile_unittest.cc

Index: cc/resources/picture_pile_unittest.cc
diff --git a/cc/resources/picture_pile_unittest.cc b/cc/resources/picture_pile_unittest.cc
index d6d75fad1cd4215a5d91d355452c0a0083e5be73..b49f683bd1bb26557fbd8e38277611ce5078af68 100644
--- a/cc/resources/picture_pile_unittest.cc
+++ b/cc/resources/picture_pile_unittest.cc
@@ -1432,5 +1432,26 @@ TEST_F(PicturePileTest, SolidRectangleIsSolid) {
   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