Implement the basics for Safebrowsing for WebView

android_webview/browser/renderer_host/aw_resource_dispatcher_host_delegate.cc

Index: android_webview/browser/renderer_host/aw_resource_dispatcher_host_delegate.cc
diff --git a/android_webview/browser/renderer_host/aw_resource_dispatcher_host_delegate.cc b/android_webview/browser/renderer_host/aw_resource_dispatcher_host_delegate.cc
index 6f63c9df9a9d520d1e2fb826f6b8b2ecb065c719..983f3c0d4404eed2ae4f7430961833074b85e935 100644
--- a/android_webview/browser/renderer_host/aw_resource_dispatcher_host_delegate.cc
+++ b/android_webview/browser/renderer_host/aw_resource_dispatcher_host_delegate.cc
@@ -17,6 +17,7 @@
 #include "android_webview/common/url_constants.h"
 #include "base/memory/scoped_vector.h"
 #include "components/navigation_interception/intercept_navigation_delegate.h"
+#include "components/safe_browsing/base_resource_throttle.h"
 #include "components/web_restrictions/browser/web_restrictions_resource_throttle.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/resource_dispatcher_host.h"
@@ -271,6 +272,17 @@ void AwResourceDispatcherHostDelegate::RequestBeginning(
   const content::ResourceRequestInfo* request_info =
       content::ResourceRequestInfo::ForRequest(request);
 
+  content::ResourceThrottle* throttle =
+      safe_browsing::BaseResourceThrottle::MaybeCreate(
+          request, resource_type,
+          AwBrowserContext::GetDefault()->GetSafeBrowsingDBManager(),
+          AwBrowserContext::GetDefault()->GetSafeBrowsingUIManager());
+  if (throttle == nullptr) {
+    LOG(WARNING) << "Failed creating safebrowsing throttle";
+  } else {
+    throttles->push_back(base::WrapUnique(throttle));
+  }
+
   // We always push the throttles here. Checking the existence of io_client
   // is racy when a popup window is created. That is because RequestBeginning
   // is called whether or not requests are blocked via BlockRequestForRoute()