Conditionalize memory allocation limit based on visibility

Replace the single value with a ManagedMemoryPolicy structure
which has the limit in bytes when visible and when not visible,
and also has a priority cutoff when visible and when not visible.

In CCRendererClient, separate the methods for specifying and
enforcing a memory policy. This is so that one may decrease the
consumption of a renderer that has grown over time, without 
disallowing growth in the future.

BUG=134750


Review URL: https://chromiumcodereview.appspot.com/11196038

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@163420 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 29 insertions, 0 deletions

diff --git a/cc/managed_memory_policy.h b/cc/managed_memory_policy.h
new file mode 100644
index 0000000..eba13c3
--- /dev/null
+++ b/cc/managed_memory_policy.h
@@ -0,0 +1,29 @@
+// Copyright 2011 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.
+
+#ifndef managed_memory_policy_h
+#define managed_memory_policy_h
+
+#include "base/basictypes.h"
+
+namespace cc {
+
+struct ManagedMemoryPolicy {
+    ManagedMemoryPolicy(size_t bytesLimitWhenVisible);
+    ManagedMemoryPolicy(size_t bytesLimitWhenVisible,
+                        int priorityCutoffWhenVisible,
+                        size_t bytesLimitWhenNotVisible,
+                        int priorityCutoffWhenNotVisible);
+    bool operator==(const ManagedMemoryPolicy&) const;
+    bool operator!=(const ManagedMemoryPolicy&) const;
+
+    size_t bytesLimitWhenVisible;
+    int priorityCutoffWhenVisible;
+    size_t bytesLimitWhenNotVisible;
+    int priorityCutoffWhenNotVisible;
+};
+
+}  // namespace cc
+
+#endif