Clear in-memory caches of renderers when rules change

chrome/browser/extensions/api/web_request/web_request_api_helpers.cc

Index: chrome/browser/extensions/api/web_request/web_request_api_helpers.cc
diff --git a/chrome/browser/extensions/api/web_request/web_request_api_helpers.cc b/chrome/browser/extensions/api/web_request/web_request_api_helpers.cc
index 5a7113d44bc6e25e2293c526ef5df4244cb85e55..faca61a38f29bb699ef66693534b63efe5f1e82d 100644
--- a/chrome/browser/extensions/api/web_request/web_request_api_helpers.cc
+++ b/chrome/browser/extensions/api/web_request/web_request_api_helpers.cc
@@ -10,7 +10,9 @@
 #include "base/stringprintf.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/api/web_request/web_request_api.h"
+#include "chrome/browser/renderer_host/web_cache_manager.h"
 #include "chrome/common/url_constants.h"
+#include "content/public/browser/browser_thread.h"
 #include "net/base/net_log.h"
 #include "net/cookies/parsed_cookie.h"
 #include "net/http/http_util.h"
@@ -58,6 +60,10 @@ COMPILE_ASSERT(
     arraysize(kResourceTypeStrings) == arraysize(kResourceTypeValues),
     keep_resource_types_in_sync);
 
+void ClearCacheOnNavigationOnUI() {
+  WebCacheManager::GetInstance()->ClearCacheOnNavigation();
+}
+
 }  // namespace
 
 RequestCookie::RequestCookie() {}
@@ -1017,4 +1023,13 @@ bool CanExtensionAccessURL(const extensions::Extension* extension,
           url.GetOrigin() == extension->url());
 }
 
+void ClearCacheOnNavigation() {
+  if (content::BrowserThread::CurrentlyOn(content::BrowserThread::UI)) {
+    ClearCacheOnNavigationOnUI();
+  } else {
+    content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
+                                     base::Bind(&ClearCacheOnNavigationOnUI));
+  }
+}
+
 }  // namespace extension_web_request_api_helpers