Allow webRequest API extensions to clear the in-memory cache of WebKit.

If the behavior of a webRequest API extension changes (i.e. different URLs are blocked) this effect was not visible instantly due to WebKit's in-memory cache. This CL introduces a means to clear the cache.

BUG=94284
TEST=no


Review URL: http://codereview.chromium.org/7835031

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@103289 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 9 insertions, 1 deletions

diff --git a/chrome/renderer/chrome_render_process_observer.h b/chrome/renderer/chrome_render_process_observer.h
index 80bf18ef..615b6c3 100644
--- a/chrome/renderer/chrome_render_process_observer.h
+++ b/chrome/renderer/chrome_render_process_observer.h
@@ -33,6 +33,10 @@ class ChromeRenderProcessObserver : public RenderProcessObserver {
 
   static bool is_incognito_process() { return is_incognito_process_; }
 
+  // Needs to be called by RenderViews in case of navigations to execute
+  // any 'clear cache' commands that were delayed until the next navigation.
+  void ExecutePendingClearCache();
+
  private:
   // RenderProcessObserver implementation.
   virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE;
@@ -45,7 +49,9 @@ class ChromeRenderProcessObserver : public RenderProcessObserver {
   void OnSetCacheCapacities(size_t min_dead_capacity,
                             size_t max_dead_capacity,
                             size_t capacity);
-  void OnClearCache();
+  // If |on_navigation| is true, the clearing is delayed until the next
+  // navigation event.
+  void OnClearCache(bool on_navigation);
   void OnGetCacheResourceStats();
   void OnSetFieldTrialGroup(const std::string& fiel_trial_name,
                             const std::string& group_name);
@@ -58,6 +64,8 @@ class ChromeRenderProcessObserver : public RenderProcessObserver {
   static bool is_incognito_process_;
   scoped_ptr<ResourceDispatcherDelegate> resource_delegate_;
   chrome::ChromeContentRendererClient* client_;
+  // If true, the web cache shall be cleared before the next navigation event.
+  bool clear_cache_pending_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeRenderProcessObserver);
 };