Implement PlatformUtil::OpenExternal() so that mailto: can work

chrome/android/java/src/org/chromium/chrome/browser/PlatformUtil.java

+// Copyright 2015 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.
+
+package org.chromium.chrome.browser;
+
+import android.content.ActivityNotFoundException;
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+
+import org.chromium.base.ApplicationStatus;
+import org.chromium.base.Log;
+import org.chromium.base.annotations.CalledByNative;
+
+/**
+ * Utility class for providing platform functionalities.
+ */
+public class PlatformUtil {
+    private static final String TAG = "cr.PlatformUtil";
+
+    @CalledByNative
+    private static void launchExternalProtocol(String url) {
+        Context context = ApplicationStatus.getApplicationContext();
+        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
+        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        intent.addCategory(Intent.CATEGORY_BROWSABLE);
+        try {
+            context.startActivity(intent);
+        } catch (ActivityNotFoundException e) {
+            Log.e(TAG, "cannot find activity to launch " + url, e);
+        }
+    }
+}