Added experimental Share API on Android behind flag.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/mojo/ChromeServiceRegistrar.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/mojo/ChromeServiceRegistrar.java b/chrome/android/java/src/org/chromium/chrome/browser/mojo/ChromeServiceRegistrar.java
index 76af5f40e4349c5e4620ba158b595da083b19086..f5b7148f5f765ce2360205bb50c4b7cdee4f123c 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/mojo/ChromeServiceRegistrar.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/mojo/ChromeServiceRegistrar.java
@@ -6,9 +6,11 @@ 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.ShareServiceImplementationFactory;
 import org.chromium.content.browser.ServiceRegistry;
 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.
@@ -18,5 +20,7 @@ class ChromeServiceRegistrar {
     private static void registerRenderFrameMojoServices(
             ServiceRegistry registry, WebContents webContents) {
         registry.addService(PaymentRequest.MANAGER, new PaymentRequestFactory(webContents));
+        registry.addService(
+                ShareService.MANAGER, new ShareServiceImplementationFactory(webContents));
     }
 }