cc: Explicitly invalidate all dropped recordings on the main thread.

cc/resources/picture_layer_tiling_set_unittest.cc

Index: cc/resources/picture_layer_tiling_set_unittest.cc
diff --git a/cc/resources/picture_layer_tiling_set_unittest.cc b/cc/resources/picture_layer_tiling_set_unittest.cc
index 868ff55947880ac0ffec36db333d852111a83446..cc865f945cee8203c08d94516ca3f4e1dd21e265 100644
--- a/cc/resources/picture_layer_tiling_set_unittest.cc
+++ b/cc/resources/picture_layer_tiling_set_unittest.cc
@@ -230,7 +230,10 @@ class PictureLayerTilingSetSyncTest : public testing::Test {
       ASSERT_TRUE(!!tile);
       EXPECT_EQ(tile->picture_pile(), pile);
       EXPECT_TRUE(tile->content_rect().Intersects(tiling->live_tiles_rect()))
-          << "All tiles must be inside the live tiles rect.";
+          << "All tiles must be inside the live tiles rect."
+          << " Tile rect: " << tile->content_rect().ToString()
+          << " Live rect: " << tiling->live_tiles_rect().ToString()
+          << " Scale: " << tiling->contents_scale();
     }
 
     for (PictureLayerTiling::CoverageIterator iter(
@@ -287,10 +290,10 @@ Tile* FindTileAtOrigin(PictureLayerTiling* tiling) {
 
 TEST_F(PictureLayerTilingSetSyncTest, KeepExisting) {
   float source_scales[] = {0.7f, 1.f, 1.1f, 2.f};
-  for (size_t i = 0; i < arraysize(source_scales); ++i)
+  for (size_t i = 1; i < arraysize(source_scales); ++i)
     source_->AddTiling(source_scales[i]);
   float target_scales[] = {0.5f, 1.f, 2.f};
-  for (size_t i = 0; i < arraysize(target_scales); ++i)
+  for (size_t i = 1; i < arraysize(target_scales); ++i)
     target_->AddTiling(target_scales[i]);
 
   PictureLayerTiling* tiling1 = source_->TilingAtScale(1.f);