Implement OnMemoryStateChange for Various CC Classes

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 317 matching lines @@
   gfx::Size size(100, 100);
   Resource* resource = resource_pool_->ReuseResource(size, format, color_space);
   EXPECT_EQ(nullptr, resource);
   size = gfx::Size(100, 99);
   resource = resource_pool_->ReuseResource(size, format, color_space);
   EXPECT_NE(nullptr, resource);
   ASSERT_EQ(nullptr, resource_pool_->ReuseResource(size, format, color_space));
   resource_pool_->ReleaseResource(resource);
 }
 
+TEST_F(ResourcePoolTest, MemoryStateSuspended) {
+  // Limits high enough to not be hit by this test.
+  size_t bytes_limit = 10 * 1024 * 1024;
+  size_t count_limit = 100;
+  resource_pool_->SetResourceUsageLimits(bytes_limit, count_limit);
+
+  gfx::Size size(100, 100);
+  ResourceFormat format = RGBA_8888;
+  gfx::ColorSpace color_space = gfx::ColorSpace::CreateSRGB();
+  Resource* resource =
+      resource_pool_->AcquireResource(size, format, color_space);
+
+  EXPECT_EQ(1u, resource_pool_->GetTotalResourceCountForTesting());
+  EXPECT_EQ(0u, resource_pool_->GetBusyResourceCountForTesting());
+
+  // Suspending should not impact an in-use resource.
+  resource_pool_->OnMemoryStateChange(base::MemoryState::SUSPENDED);
+  EXPECT_EQ(1u, resource_pool_->GetTotalResourceCountForTesting());
+  EXPECT_EQ(0u, resource_pool_->GetBusyResourceCountForTesting());
+  resource_pool_->OnMemoryStateChange(base::MemoryState::NORMAL);
+
+  // Release the resource making it busy.
+  resource_pool_->ReleaseResource(resource);
+  EXPECT_EQ(1u, resource_pool_->GetTotalResourceCountForTesting());
+  EXPECT_EQ(1u, resource_pool_->GetBusyResourceCountForTesting());
+
+  // Suspending should now free the busy resource.
+  resource_pool_->OnMemoryStateChange(base::MemoryState::SUSPENDED);
+  EXPECT_EQ(0u, resource_pool_->GetTotalResourceCountForTesting());
+  EXPECT_EQ(0u, resource_pool_->GetBusyResourceCountForTesting());
+}
+
 }  // namespace cc