Add Android implementation of navigator.getInstalledRelatedApps.

content/public/android/java/src/org/chromium/content/browser/installedapp/InstalledAppProviderFactory.java

+// Copyright 2017 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.content.browser.installedapp;
+
+import org.chromium.base.ContextUtils;
+import org.chromium.content_public.browser.RenderFrameHost;
+import org.chromium.installedapp.mojom.InstalledAppProvider;
+import org.chromium.services.service_manager.InterfaceFactory;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+
+/** Factory to create instances of the InstalledAppProvider Mojo service. */
+public class InstalledAppProviderFactory implements InterfaceFactory<InstalledAppProvider> {
+    private final PageUrlDelegateImpl mPageUrlDelegate;
+
+    private static final class PageUrlDelegateImpl
+            implements InstalledAppProviderImpl.PageUrlDelegate {
+        private final RenderFrameHost mRenderFrameHost;
+
+        public PageUrlDelegateImpl(RenderFrameHost renderFrameHost) {
+            mRenderFrameHost = renderFrameHost;
+        }
+
+        @Override
+        public URI getUrl() {
+            try {
+                return new URI(mRenderFrameHost.getLastCommittedURL());

[dcheng, 2017/03/21 07:37:50]

Nit: seems like the RenderFrameHost interface should just be returning a URI?

[Matt Giuca, 2017/03/21 07:46:01]

Yes, I agree. I looked at doing this, but the only other client (this was
literally added last week) passes it to a function expecting a String. Changing
that interface to return a URI would mean parsing then stringifying it in that
other client. So... I just left it as-is.

[boliu, 2017/03/21 15:36:59]

getLastCommittedURL can legitimately return null, if the native RFH is gone. I
guess renderer side should be gone too by that point, but since these calls are
async, probably should be safe than sorry?

[Matt Giuca, 2017/03/22 00:28:47]

Done.

(If this returns null, it's handled in isAppInstalledAndAssociatedWithOrigin
which returns false, meaning there are 0 installed apps.)

+            } catch (URISyntaxException e) {
+                throw new AssertionError(e);
+            }
+        }
+    }
+
+    public InstalledAppProviderFactory(RenderFrameHost renderFrameHost) {
+        mPageUrlDelegate = new PageUrlDelegateImpl(renderFrameHost);
+    }
+
+    @Override
+    public InstalledAppProvider createImpl() {
+        return new InstalledAppProviderImpl(mPageUrlDelegate, ContextUtils.getApplicationContext());
+    }
+}