cc: Fix bugs found by fuzzer due to floating point imprecision.

cc/tiles/picture_layer_tiling_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/tiles/picture_layer_tiling.h"
 
 #include <stddef.h>
 
 #include <limits>
 #include <set>
@@ skipping 1237 matching lines @@
   expectation.Scale(1.5f / 1.56f);
   expectation.Offset(0.5f, 0.5f);
   EXPECT_FLOAT_EQ(expectation.x(), texture_rect.x());
   EXPECT_FLOAT_EQ(expectation.y(), texture_rect.y());
   EXPECT_FLOAT_EQ(expectation.width(), texture_rect.width());
   EXPECT_FLOAT_EQ(expectation.height(), texture_rect.height());
 
   EXPECT_FALSE(++iter);
 }
 
+TEST_F(PictureLayerTilingIteratorTest, EdgeCaseLargeIntBounds) {
+  gfx::Size tile_size(256, 256);
+  float scale = 7352.331055f;
+  gfx::Size layer_bounds(292082, 26910);
+  gfx::Rect coverage_rect(2104641536, 522015, 29440, 66172);
+  Initialize(tile_size, scale, layer_bounds);
+  int count = 0;
+  for (PictureLayerTiling::CoverageIterator
+           iter(tiling_.get(), scale, coverage_rect);
+       iter && count < 200; ++count, ++iter) {
+    EXPECT_FALSE(iter.geometry_rect().IsEmpty());
+  }
+}
+
+TEST_F(PictureLayerTilingIteratorTest, EdgeCaseLargeIntBounds2) {
+  gfx::RectF rect(2104670720.f, 522014.5f, 192.f, 1.f);
+  gfx::Size tile_size(256, 256);
+  float scale = 7352.331055f;
+  gfx::Size layer_bounds(292082, 26910);
+  gfx::Rect coverage_rect(2104670720, 522015, 192, 1);
+  Initialize(tile_size, scale, layer_bounds);
+  for (PictureLayerTiling::CoverageIterator iter(tiling_.get(), scale,
+                                                 coverage_rect);
+       iter; ++iter) {
+    EXPECT_FALSE(iter.geometry_rect().IsEmpty());
+  }
+}
+
 }  // namespace
 }  // namespace cc