cc: Stretch textures by .5 texels to prevent out of bounds sampling

cc/picture_layer_tiling_set_unittest.cc

 // Copyright 2012 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 "cc/picture_layer_tiling_set.h"
 
 #include "cc/resource_pool.h"
 #include "cc/resource_provider.h"
 #include "cc/test/fake_output_surface.h"
 #include "cc/test/fake_picture_layer_tiling_client.h"
@@ skipping 19 matching lines @@
   float contents_scale = 2.0;
   gfx::Size content_bounds(
       gfx::ToCeiledSize(gfx::ScaleSize(layer_bounds, contents_scale)));
   gfx::Rect content_rect(gfx::Point(), content_bounds);
 
   Region remaining(content_rect);
   PictureLayerTilingSet::Iterator iter(
       &set,
       contents_scale,
       content_rect,
-      contents_scale);
+      contents_scale,
+      PictureLayerTiling::LayerDeviceAlignmentUnknown);
   for (; iter; ++iter) {
     gfx::Rect geometry_rect = iter.geometry_rect();
     EXPECT_TRUE(content_rect.Contains(geometry_rect));
     ASSERT_TRUE(remaining.Contains(geometry_rect));
     remaining.Subtract(geometry_rect);
 
     // No tiles have resources, so no iter represents a real tile.
     EXPECT_FALSE(*iter);
   }
   EXPECT_TRUE(remaining.IsEmpty());
@@ skipping 37 matching lines @@
     float max_contents_scale = scale;
     gfx::Size content_bounds(
         gfx::ToCeiledSize(gfx::ScaleSize(layer_bounds, max_contents_scale)));
     gfx::Rect content_rect(gfx::Point(), content_bounds);
 
     Region remaining(content_rect);
     PictureLayerTilingSet::Iterator iter(
         &set,
         max_contents_scale,
         content_rect,
-        ideal_contents_scale);
+        ideal_contents_scale,
+        PictureLayerTiling::LayerDeviceAlignmentUnknown);
     for (; iter; ++iter) {
       gfx::Rect geometry_rect = iter.geometry_rect();
       EXPECT_TRUE(content_rect.Contains(geometry_rect));
       ASSERT_TRUE(remaining.Contains(geometry_rect));
       remaining.Subtract(geometry_rect);
 
       float scale = iter.CurrentTiling()->contents_scale();
       EXPECT_EQ(expected_scale, scale);
 
       if (num_tilings)
@@ skipping 33 matching lines @@
 TEST_F(PictureLayerTilingSetTestWithResources, ManyTilings_Equal) {
   runTest(10, 1.f, 1.f, 5.f, 5.f);
 }
 
 TEST_F(PictureLayerTilingSetTestWithResources, ManyTilings_NotEqual) {
   runTest(10, 1.f, 1.f, 4.5f, 5.f);
 }
 
 }  // namespace
 }  // namespace cc