Implement the basics for Safebrowsing for WebView

android_webview/java/src/org/chromium/android_webview/AwBrowserContext.java

Index: android_webview/java/src/org/chromium/android_webview/AwBrowserContext.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwBrowserContext.java b/android_webview/java/src/org/chromium/android_webview/AwBrowserContext.java
index 32ee78b934fd8163ee8a1a65d22d9d1f4c5b3a91..54ae05d76cc6af4d7a54235f0dfa2753f6b8a1ff 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwBrowserContext.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwBrowserContext.java
@@ -7,6 +7,9 @@ package org.chromium.android_webview;
 import android.content.Context;
 import android.content.SharedPreferences;
 
+import org.chromium.base.Log;
+import org.chromium.components.safe_browsing.SafeBrowsingApiBridge;
+import org.chromium.components.safe_browsing.SafeBrowsingApiHandler;
 import org.chromium.content.browser.AppWebMessagePortService;
 import org.chromium.content.browser.ContentViewStatics;
 
@@ -19,6 +22,7 @@ import org.chromium.content.browser.ContentViewStatics;
  * AwBrowserContext instance, so at this point the class mostly exists for conceptual clarity.
  */
 public class AwBrowserContext {
+    private static final String TAG = "AwBrowserContext";
     private final SharedPreferences mSharedPreferences;
 
     private AwGeolocationPermissions mGeolocationPermissions;
@@ -28,10 +32,25 @@ public class AwBrowserContext {
     private AwServiceWorkerController mServiceWorkerController;
     private Context mApplicationContext;
 
+    @SuppressWarnings("unchecked")
     public AwBrowserContext(SharedPreferences sharedPreferences, Context applicationContext) {
         mSharedPreferences = sharedPreferences;
         mMetricsServiceClient = new AwMetricsServiceClient(applicationContext);
         mApplicationContext = applicationContext;
+
+        final String safeBrowsingApiHandler =
+                "com.android.webview.chromium.AwSafeBrowsingApiHandler";
+
+        // Try to get a specialized service bridge.
+        try {
+            Class<? extends SafeBrowsingApiHandler> cls =
+                    (Class<? extends SafeBrowsingApiHandler>)
+                            Class.forName(safeBrowsingApiHandler);
+            SafeBrowsingApiBridge.setSafeBrowingHandlerType(cls);
+        } catch (ClassNotFoundException e) {
+            Log.w(TAG, "Could not find SafeBrowsingApiHandler");
+            // This is not an error; it just means this device doesn't have specialized services.
+        }
     }
 
     public AwGeolocationPermissions getGeolocationPermissions() {