Re-land: base: Implement browser process support for discardable memory.

content/test/blink_test_environment.cc

 // Copyright 2014 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 "content/test/blink_test_environment.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/string_tokenizer.h"
+#include "base/test/test_discardable_memory_shmem_allocator.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/user_agent.h"
 #include "content/public/test/test_content_client_initializer.h"
 #include "content/test/test_blink_web_unit_test_support.h"
 #include "third_party/WebKit/public/web/WebCache.h"
 #include "third_party/WebKit/public/web/WebKit.h"
 #include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
 #include "url/url_util.h"
 
@@ skipping 37 matching lines @@
 #else
   typedef base::MessageLoopForUI MessageLoopType;
 #endif
 
   TestEnvironment() {
     main_message_loop_.reset(new MessageLoopType);
 
     // TestBlinkWebUnitTestSupport must be instantiated after MessageLoopType.
     blink_test_support_.reset(new TestBlinkWebUnitTestSupport);
     content_initializer_.reset(new content::TestContentClientInitializer());
+
+    base::DiscardableMemoryShmemAllocator::SetInstance(
+        &discardable_memory_allocator_);
   }
 
   ~TestEnvironment() {
   }
 
   TestBlinkWebUnitTestSupport* blink_platform_impl() const {
     return blink_test_support_.get();
   }
 
  private:
   scoped_ptr<MessageLoopType> main_message_loop_;
   scoped_ptr<TestBlinkWebUnitTestSupport> blink_test_support_;
   scoped_ptr<TestContentClientInitializer> content_initializer_;
+  base::TestDiscardableMemoryShmemAllocator discardable_memory_allocator_;
 };
 
 TestEnvironment* test_environment;
 
 }  // namespace
 
 void SetUpBlinkTestEnvironment() {
   ParseBlinkCommandLineArgumentsForUnitTests();
 
   blink::WebRuntimeFeatures::enableExperimentalFeatures(true);
@@ skipping 24 matching lines @@
   // http://code.google.com/p/chromium/issues/detail?id=9500
   base::RunLoop().RunUntilIdle();
 
   if (RunningOnValgrind())
     blink::WebCache::clear();
   delete test_environment;
   test_environment = NULL;
 }
 
 }  // namespace content