[WebView] initial webview-side implementation of safebrowsing

android_webview/lib/main/aw_main_delegate.cc

Index: android_webview/lib/main/aw_main_delegate.cc
diff --git a/android_webview/lib/main/aw_main_delegate.cc b/android_webview/lib/main/aw_main_delegate.cc
index 27601c53d1efd06334087c4319e09569fa483d1a..623025b3ffbaff60b4072b7eaa62b3b3aa9427b0 100644
--- a/android_webview/lib/main/aw_main_delegate.cc
+++ b/android_webview/lib/main/aw_main_delegate.cc
@@ -31,6 +31,7 @@
 #include "base/threading/thread_restrictions.h"
 #include "cc/base/switches.h"
 #include "components/crash/content/app/breakpad_linux.h"
+#include "components/safe_browsing_db/android/safe_browsing_api_handler_bridge.h"
 #include "components/spellcheck/common/spellcheck_features.h"
 #include "content/public/browser/android/browser_media_player_manager_register.h"
 #include "content/public/browser/browser_main_runner.h"
@@ -155,6 +156,14 @@ bool AwMainDelegate::BasicStartupComplete(int* exit_code) {
 
   android_webview::RegisterPathProvider();
 
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kWebViewEnableSafeBrowsingSupport)) {
+    safe_browsing_api_handler_.reset(
+        new safe_browsing::SafeBrowsingApiHandlerBridge());
+    safe_browsing::SafeBrowsingApiHandler::SetInstance(
+        safe_browsing_api_handler_.get());
+  }
+
   return false;
 }