<webview> Implement clear http cache API.

chrome/browser/guest_view/web_view/chrome_web_view_guest_delegate.cc

 // Copyright 2014 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 "chrome/browser/guest_view/web_view/chrome_web_view_guest_delegate.h"
 
+#include "chrome/browser/browsing_data/storage_partition_http_cache_data_remover.h"
 #include "chrome/browser/extensions/chrome_extension_web_contents_observer.h"
 #include "chrome/browser/favicon/favicon_tab_helper.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/renderer_context_menu/render_view_context_menu.h"
 #include "chrome/browser/ui/pdf/chrome_pdf_web_contents_helper_client.h"
 #include "chrome/common/chrome_version_info.h"
 #include "components/pdf/browser/pdf_web_contents_helper.h"
 #include "components/renderer_context_menu/context_menu_delegate.h"
+#include "components/web_cache/browser/web_cache_manager.h"
+#include "content/public/browser/render_process_host.h"
 #include "extensions/browser/api/web_request/web_request_api.h"
 #include "extensions/browser/guest_view/web_view/web_view_constants.h"
 
 #if defined(ENABLE_PRINTING)
 #if defined(ENABLE_PRINT_PREVIEW)
 #include "chrome/browser/printing/print_preview_message_handler.h"
 #include "chrome/browser/printing/print_view_manager.h"
 #else
 #include "chrome/browser/printing/print_view_manager_basic.h"
 #endif  // defined(ENABLE_PRINT_PREVIEW)
 #endif  // defined(ENABLE_PRINTING)
 
 namespace extensions {
 
 ChromeWebViewGuestDelegate::ChromeWebViewGuestDelegate(
     WebViewGuest* web_view_guest)
     : pending_context_menu_request_id_(0),
       chromevox_injected_(false),
       web_view_guest_(web_view_guest),
       weak_ptr_factory_(this) {
 }
 
 ChromeWebViewGuestDelegate::~ChromeWebViewGuestDelegate() {
 }
 
+void ChromeWebViewGuestDelegate::ClearCache(
+    base::Time remove_since,
+    const base::Closure& done_callback) {
+  int render_process_id = guest_web_contents()->GetRenderProcessHost()->GetID();
+  // We need to clear renderer cache separately for our process because
+  // StoragePartitionHttpCacheDataRemover::ClearData() does not clear that.
+  web_cache::WebCacheManager::GetInstance()->Remove(render_process_id);
+  web_cache::WebCacheManager::GetInstance()->ClearCacheForProcess(
+      render_process_id);
+
+  content::StoragePartition* partition =
+      content::BrowserContext::GetStoragePartition(
+          guest_web_contents()->GetBrowserContext(),
+          guest_web_contents()->GetSiteInstance());
+
+  // StoragePartitionHttpCacheDataRemover removes itself when it is done.
+  // TODO(lazyboy): Once StoragePartitionHttpCacheDataRemover moves to
+  // components/, move |ClearCache| to WebViewGuest: http//crbug.com/471287.
+  StoragePartitionHttpCacheDataRemover::CreateForRange(
+      partition, remove_since, base::Time::Now())->Remove(done_callback);
+}
+
 bool ChromeWebViewGuestDelegate::HandleContextMenu(
     const content::ContextMenuParams& params) {
   ContextMenuDelegate* menu_delegate =
       ContextMenuDelegate::FromWebContents(guest_web_contents());
   DCHECK(menu_delegate);
 
   pending_menu_ = menu_delegate->BuildMenu(guest_web_contents(), params);
 
   // Pass it to embedder.
   int request_id = ++pending_context_menu_request_id_;
@@ skipping 116 matching lines @@
       chromeos::ACCESSIBILITY_TOGGLE_SPOKEN_FEEDBACK) {
     if (details.enabled)
       InjectChromeVoxIfNeeded(guest_web_contents()->GetRenderViewHost());
     else
       chromevox_injected_ = false;
   }
 }
 #endif
 
 }  // namespace extensions