Change ResourcePool reuse to have looser size constraints.

cc/resources/resource_pool_unittest.cc

 // Copyright 2015 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/resources/resource_pool.h"
 
 #include <stddef.h>
 
 #include "base/run_loop.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 292 matching lines @@
   // content ID and that it has the expected invalidated rect.
   gfx::Rect total_invalidated_rect;
   reacquired_resource = resource_pool_->TryAcquireResourceForPartialRaster(
       content_ids[2], second_invalidated_rect, content_ids[1],
       &total_invalidated_rect);
   EXPECT_EQ(resource, reacquired_resource);
   EXPECT_EQ(expected_total_invalidated_rect, total_invalidated_rect);
   resource_pool_->ReleaseResource(reacquired_resource);
 }
 
+TEST_F(ResourcePoolTest, ReuseResourceExactMatch) {
+  ResourceFormat format = RGBA_8888;
+  gfx::ColorSpace color_space = gfx::ColorSpace::CreateSRGB();
+
+  // Create unused resources with sizes close to 100, 100.
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(99, 100), format, color_space));
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(99, 99), format, color_space));
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(100, 99), format, color_space));
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(101, 101), format, color_space));
+  resource_pool_->CheckBusyResources();
+
+  gfx::Size size(100, 100);
+  EXPECT_EQ(nullptr,
+            resource_pool_->ReuseResource(size, size, format, color_space));
+  size = gfx::Size(100, 99);
+  EXPECT_NE(nullptr,
+            resource_pool_->ReuseResource(size, size, format, color_space));
+  EXPECT_EQ(nullptr,
+            resource_pool_->ReuseResource(size, size, format, color_space));
+}
+
+TEST_F(ResourcePoolTest, ReuseResourceFuzzyMatch) {
+  ResourceFormat format = RGBA_8888;
+  gfx::ColorSpace color_space = gfx::ColorSpace::CreateSRGB();
+
+  // Create unused resources with sizes close to 100, 100.
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(99, 100), format, color_space));
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(99, 99), format, color_space));
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(100, 99), format, color_space));
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(101, 101), format, color_space));
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(202, 202), format, color_space));
+  resource_pool_->CheckBusyResources();
+
+  EXPECT_EQ(nullptr,
+            resource_pool_->ReuseResource(
+                gfx::Size(50, 100), gfx::Size(50, 102), format, color_space));
+  EXPECT_EQ(nullptr,
+            resource_pool_->ReuseResource(
+                gfx::Size(100, 102), gfx::Size(102, 102), format, color_space));
+  EXPECT_NE(nullptr,
+            resource_pool_->ReuseResource(
+                gfx::Size(100, 100), gfx::Size(200, 200), format, color_space));
+  EXPECT_EQ(nullptr,
+            resource_pool_->ReuseResource(
+                gfx::Size(100, 100), gfx::Size(200, 200), format, color_space));
+}
+
 }  // namespace
 }  // namespace cc