Add the ability to clear the shader disk cache.

content/public/browser/shader_disk_cache.h

Index: content/public/browser/shader_disk_cache.h
diff --git a/content/public/browser/shader_disk_cache.h b/content/public/browser/shader_disk_cache.h
new file mode 100644
index 0000000000000000000000000000000000000000..95b5a76dcf4bad8369f1af1da4897b9ddce85eea
--- /dev/null
+++ b/content/public/browser/shader_disk_cache.h
@@ -0,0 +1,33 @@
+// Copyright (c) 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.
+
+#ifndef CONTENT_PUBLIC_BROWSER_SHADER_DISK_CACHE_H_
+#define CONTENT_PUBLIC_BROWSER_SHADER_DISK_CACHE_H_
+
+#include <map>
+#include <string>
+
+#include "base/callback.h"
+#include "base/files/file_path.h"
+#include "base/time.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+// ShaderCacheFactory maintains a cache of ShaderDiskCache objects
+// so we only create one per profile directory.
+class CONTENT_EXPORT ShaderCacheFactory {
+ public:
+  static ShaderCacheFactory* GetInstance();
+
+  virtual void ClearByPath(const base::FilePath& path,
+                           const base::Time& delete_begin,
+                           const base::Time& delete_end,
+                           const base::Closure& callback) = 0;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_SHADER_DISK_CACHE_H_
+