Add the ability to clear the shader disk cache.

chrome/browser/browsing_data/browsing_data_remover.h

Index: chrome/browser/browsing_data/browsing_data_remover.h
diff --git a/chrome/browser/browsing_data/browsing_data_remover.h b/chrome/browser/browsing_data/browsing_data_remover.h
index acb426e3515b1a1c9f202c03c7211cabbab66b6b..b926914509a250ba079fd78416619a93efa77dab 100644
--- a/chrome/browser/browsing_data/browsing_data_remover.h
+++ b/chrome/browser/browsing_data/browsing_data_remover.h
@@ -82,17 +82,18 @@ class BrowsingDataRemover : public content::NotificationObserver
     REMOVE_WEBSQL = 1 << 11,
     REMOVE_SERVER_BOUND_CERTS = 1 << 12,
     REMOVE_CONTENT_LICENSES = 1 << 13,
+    REMOVE_SHADER_CACHE = 1 << 14,
     // The following flag is used only in tests. In normal usage, hosted app
     // data is controlled by the REMOVE_COOKIES flag, applied to the
     // protected-web origin.
     REMOVE_HOSTED_APP_DATA_TESTONLY = 1 << 31,
 
     // "Site data" includes cookies, appcache, file systems, indexedDBs, local
-    // storage, webSQL, and plugin data.
+    // storage, webSQL, shader, and plugin data.
     REMOVE_SITE_DATA = REMOVE_APPCACHE | REMOVE_COOKIES | REMOVE_FILE_SYSTEMS |
                        REMOVE_INDEXEDDB | REMOVE_LOCAL_STORAGE |
                        REMOVE_PLUGIN_DATA | REMOVE_WEBSQL |
-                       REMOVE_SERVER_BOUND_CERTS
+                       REMOVE_SERVER_BOUND_CERTS | REMOVE_SHADER_CACHE
   };
 
   // When BrowsingDataRemover successfully removes data, a notification of type
@@ -339,6 +340,18 @@ class BrowsingDataRemover : public content::NotificationObserver
   // Callback from the above method.
   void OnClearedFormData();
 
+  // Callback when the shader cache has been deleted.
+  // Invokes NotifyAndDeleteIfDone.
+  void ClearedShaderCache();
+
+  // Invokes the ClearedShaderCache on the UI thread.
+  void ClearedShaderCacheOnIOThread();
+
+  // Invoked on the IO thread to delete from the shader cache.
+  void ClearShaderCacheOnIOThread(const base::FilePath path,
+                                  const base::Time delete_begin,
+                                  const base::Time delete_end);
+
   // Returns true if we're all done.
   bool AllDone();
 
@@ -400,6 +413,7 @@ class BrowsingDataRemover : public content::NotificationObserver
   bool waiting_for_clear_quota_managed_data_;
   bool waiting_for_clear_server_bound_certs_;
   bool waiting_for_clear_session_storage_;
+  bool waiting_for_clear_shader_cache_;
 
   // Tracking how many origins need to be deleted, and whether we're finished
   // gathering origins.