<webview> Implement clear http cache API.

components/web_cache/browser/web_cache_manager.cc

 // Copyright (c) 2012 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 "components/web_cache/browser/web_cache_manager.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 306 matching lines @@
                                      max_dead_capacity);
       }
       host->Send(new WebCacheMsg_SetCacheCapacities(min_dead_capacity,
                                                     max_dead_capacity,
                                                     capacity));
     }
     ++allocation;
   }
 }
 
+void WebCacheManager::ClearCacheForProcess(int render_process_id) {
+  ClearRendererCache(std::set<int>({render_process_id}), INSTANTLY);
+}
+
 void WebCacheManager::ClearRendererCache(
     const std::set<int>& renderers,
     WebCacheManager::ClearCacheOccasion occasion) {
   std::set<int>::const_iterator iter = renderers.begin();
   for (; iter != renderers.end(); ++iter) {
     content::RenderProcessHost* host =
         content::RenderProcessHost::FromID(*iter);
     if (host)
       host->Send(new WebCacheMsg_ClearCache(occasion == ON_NAVIGATION));
   }
@@ skipping 90 matching lines @@
       inactive_renderers_.insert(*iter);
       active_renderers_.erase(*iter);
       iter = active_renderers_.begin();
       continue;
     }
     ++iter;
   }
 }
 
 }  // namespace web_cache