[Android WebView] OnMemoryPressure to drop tile memory

content/public/browser/android/synchronous_compositor.cc

 // Copyright 2013 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/public/browser/android/synchronous_compositor.h"
 
 namespace content {
 
 SynchronousCompositorMemoryPolicy::SynchronousCompositorMemoryPolicy()
     : bytes_limit(0), num_resources_limit(0) {}
 
+bool SynchronousCompositorMemoryPolicy::operator==(
+    const SynchronousCompositorMemoryPolicy& other) const {
+  return bytes_limit == other.bytes_limit &&
+      num_resources_limit == other.num_resources_limit;
+}
+
+bool SynchronousCompositorMemoryPolicy::operator!=(
+    const SynchronousCompositorMemoryPolicy& other) const {
+  return !(*this == other);
+}
+
 }  // namespace content