Added experimental Share API on Android behind flag.

chrome/android/java/src/org/chromium/chrome/browser/mojo/ChromeServiceRegistrar.java

 // Copyright 2016 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.mojo;
 
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.chrome.browser.payments.PaymentRequestFactory;
+import org.chromium.chrome.browser.webshare.ShareServiceImpl;
 import org.chromium.content.browser.ServiceRegistry;
+import org.chromium.content.browser.ServiceRegistry.ImplementationFactory;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.mojom.payments.PaymentRequest;
+import org.chromium.mojom.webshare.ShareService;
 
 /**
  * Registers mojo services exposed by Chrome in the given registry.
  */
 class ChromeServiceRegistrar {
+    private static class ShareServiceImplementationFactory

[Sam McNally, 2016/07/26 08:21:51]

Why is this here?

[Matt Giuca, 2016/07/28 05:58:32]

Follows the pattern here:
https://cs.chromium.org/chromium/src/content/public/android/java/src/org/chro...

If your factory is only needed in this registrar, it's a simple private class
inside the registrar. PaymentRequestFactory is a bigger deal so it has its own
file.

[Sam McNally, 2016/07/28 07:16:04]

The pattern described by
"BatteryMonitorFactory can't implement ImplementationFactory itself, as we don't
depend on /content in /device. Hence we use BatteryMonitorImplementationFactory
as a wrapper."?

[Matt Giuca, 2016/07/28 07:40:42]

I was looking at the VibrationManagerImplementationFactory there, which doesn't
have a corresponding other factory.

Are you suggesting that I should move this class to its own file in the
chrome/browser/webshare directory?

[Matt Giuca, 2016/07/28 07:56:09]

Done.

+            implements ImplementationFactory<ShareService> {
+        private final WebContents mWebContents;
+
+        ShareServiceImplementationFactory(WebContents webContents) {
+            mWebContents = webContents;
+        }
+
+        @Override
+        public ShareService createImpl() {
+            return new ShareServiceImpl(mWebContents);
+        }
+    }
+
     @CalledByNative
     private static void registerRenderFrameMojoServices(
             ServiceRegistry registry, WebContents webContents) {
         registry.addService(PaymentRequest.MANAGER, new PaymentRequestFactory(webContents));
+        registry.addService(
+                ShareService.MANAGER, new ShareServiceImplementationFactory(webContents));
     }
 }