Implement Android WebView clearCache clear disk cache

Second part to implementing clearCache which clears the http disk cache.
Code is similar to BrowsingDataRemover::DoClearCache but simpler.

BUG=


Review URL: https://chromiumcodereview.appspot.com/11047009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@160314 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 106 insertions, 0 deletions

diff --git a/android_webview/browser/net_disk_cache_remover.cc b/android_webview/browser/net_disk_cache_remover.cc
new file mode 100644
index 0000000..27b5f1d
--- /dev/null
+++ b/android_webview/browser/net_disk_cache_remover.cc
@@ -0,0 +1,76 @@
+// 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 "android_webview/browser/net_disk_cache_remover.h"
+
+#include "base/bind_helpers.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/web_contents.h"
+#include "net/disk_cache/disk_cache.h"
+#include "net/http/http_cache.h"
+#include "net/http/http_transaction_factory.h"
+#include "net/url_request/url_request_context_getter.h"
+#include "net/url_request/url_request_context.h"
+#include "net/base/completion_callback.h"
+
+using content::BrowserThread;
+using disk_cache::Backend;
+using net::CompletionCallback;
+using net::URLRequestContextGetter;
+
+namespace {
+// Everything is called and accessed on the IO thread.
+
+void Noop(int rv) {
+  DCHECK(rv == net::OK);
+}
+
+void CallDoomAllEntries(Backend** backend, int rv) {
+  DCHECK(rv == net::OK);
+  (*backend)->DoomAllEntries(base::Bind(&Noop));
+}
+
+void ClearHttpDiskCacheOfContext(URLRequestContextGetter* context_getter) {
+  typedef Backend* BackendPtr;  // Make line below easier to understand.
+  BackendPtr* backend_ptr = new BackendPtr(NULL);
+  CompletionCallback callback(base::Bind(&CallDoomAllEntries,
+                                         base::Owned(backend_ptr)));
+
+  int rv = context_getter->GetURLRequestContext()->
+    http_transaction_factory()->GetCache()->GetBackend(backend_ptr, callback);
+
+  // If not net::ERR_IO_PENDING, then backend pointer is updated but callback
+  // is not called, so call it explicitly.
+  if (rv != net::ERR_IO_PENDING)
+    callback.Run(net::OK);
+}
+
+void ClearHttpDiskCacheOnIoThread(
+    URLRequestContextGetter* main_context_getter,
+    URLRequestContextGetter* media_context_getter) {
+  ClearHttpDiskCacheOfContext(main_context_getter);
+  ClearHttpDiskCacheOfContext(media_context_getter);
+}
+
+}  // namespace
+
+namespace android_webview {
+
+void RemoveHttpDiskCache(content::BrowserContext* browser_context,
+                        int renderer_child_id) {
+  URLRequestContextGetter* main_context_getter =
+      browser_context->GetRequestContextForRenderProcess(renderer_child_id);
+  URLRequestContextGetter* media_context_getter =
+      browser_context->GetMediaRequestContextForRenderProcess(
+          renderer_child_id);
+
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&ClearHttpDiskCacheOnIoThread,
+                 base::Unretained(main_context_getter),
+                 base::Unretained(media_context_getter)));
+}
+
+}  // namespace android_webview
diff --git a/android_webview/browser/net_disk_cache_remover.h b/android_webview/browser/net_disk_cache_remover.h
new file mode 100644
index 0000000..fd2c84e
--- /dev/null
+++ b/android_webview/browser/net_disk_cache_remover.h
@@ -0,0 +1,23 @@
+// 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.
+
+#ifndef ANDROID_WEBVIEW_BROWSER_NET_DISK_CACHE_REMOVER_H_
+#define ANDROID_WEBVIEW_BROWSER_NET_DISK_CACHE_REMOVER_H_
+
+namespace content {
+
+class BrowserContext;
+
+}  // namespace content
+
+namespace android_webview {
+
+// Clear all http disk cache for this renderer. This method is asynchronous and
+// will noop if a previous call has not finished.
+void RemoveHttpDiskCache(content::BrowserContext* browser_context,
+                        int renderer_child_id);
+
+}  // namespace android_webview
+
+#endif  // ANDROID_WEBVIEW_BROWSER_NET_DISK_CACHE_REMOVER_H_
diff --git a/android_webview/browser/renderer_host/aw_render_view_host_ext.cc b/android_webview/browser/renderer_host/aw_render_view_host_ext.cc
index 63ac993..66e7134 100644
--- a/android_webview/browser/renderer_host/aw_render_view_host_ext.cc
+++ b/android_webview/browser/renderer_host/aw_render_view_host_ext.cc
@@ -32,6 +32,10 @@ void AwRenderViewHostExt::DocumentHasImages(DocumentHasImagesResult result) {
                                        this_id));
 }
 
+void AwRenderViewHostExt::ClearCache() {
+  Send(new AwViewMsg_ClearCache);
+}
+
 void AwRenderViewHostExt::RenderViewGone(base::TerminationStatus status) {
   DCHECK(CalledOnValidThread());
   for (std::map<int, DocumentHasImagesResult>::iterator pending_req =
diff --git a/android_webview/browser/renderer_host/aw_render_view_host_ext.h b/android_webview/browser/renderer_host/aw_render_view_host_ext.h
index f5bade2..fcde789 100644
--- a/android_webview/browser/renderer_host/aw_render_view_host_ext.h
+++ b/android_webview/browser/renderer_host/aw_render_view_host_ext.h
@@ -25,6 +25,9 @@ class AwRenderViewHostExt : public content::WebContentsObserver,
   typedef base::Callback<void(bool)> DocumentHasImagesResult;
   void DocumentHasImages(DocumentHasImagesResult result);
 
+  // Clear all WebCore memory cache (not only for this view).
+  void ClearCache();
+
  private:
   // content::WebContentsObserver implementation.
   virtual void RenderViewGone(base::TerminationStatus status) OVERRIDE;