Add Android implementation of navigator.getInstalledRelatedApps.

content/public/android/java/src/org/chromium/content/browser/InterfaceRegistrarImpl.java

Index: content/public/android/java/src/org/chromium/content/browser/InterfaceRegistrarImpl.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/InterfaceRegistrarImpl.java b/content/public/android/java/src/org/chromium/content/browser/InterfaceRegistrarImpl.java
index c1f76a14394e1b795a72069b6b7b822fcfcfd6e7..680e9d472fc272f3795a13c4bd3c9b48f29ff4b7 100644
--- a/content/public/android/java/src/org/chromium/content/browser/InterfaceRegistrarImpl.java
+++ b/content/public/android/java/src/org/chromium/content/browser/InterfaceRegistrarImpl.java
@@ -9,6 +9,7 @@ import android.content.Context;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.content.browser.androidoverlay.AndroidOverlayProviderImpl;
+import org.chromium.content.browser.installedapp.InstalledAppProviderFactory;
 import org.chromium.content.browser.shapedetection.FaceDetectionProviderImpl;
 import org.chromium.content_public.browser.InterfaceRegistrar;
 import org.chromium.content_public.browser.RenderFrameHost;
@@ -18,6 +19,7 @@ import org.chromium.device.battery.BatteryMonitorFactory;
 import org.chromium.device.mojom.VibrationManager;
 import org.chromium.device.nfc.mojom.Nfc;
 import org.chromium.device.vibration.VibrationManagerImpl;
+import org.chromium.installedapp.mojom.InstalledAppProvider;
 import org.chromium.media.mojom.AndroidOverlayProvider;
 import org.chromium.mojo.system.impl.CoreImpl;
 import org.chromium.services.service_manager.InterfaceRegistry;
@@ -62,6 +64,8 @@ class InterfaceRegistrarImpl {
         InterfaceRegistrar.Registry.addContextRegistrar(new ContentContextInterfaceRegistrar());
         InterfaceRegistrar.Registry.addWebContentsRegistrar(
                 new ContentWebContentsInterfaceRegistrar());
+        InterfaceRegistrar.Registry.addRenderFrameHostRegistrar(
+                new ContentRenderFrameHostInterfaceRegistrar());
     }
 
     private static class ContentContextInterfaceRegistrar implements InterfaceRegistrar<Context> {
@@ -87,4 +91,14 @@ class InterfaceRegistrarImpl {
             registry.addInterface(Nfc.MANAGER, new NfcFactory(webContents));
         }
     }
+
+    private static class ContentRenderFrameHostInterfaceRegistrar

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

Nit: though this CL didn't introduce it, it would be useful to have some
comments describing the difference between ContentContextInterfaceRegistrar,
ContentWebContentsInterfaceRegistrar, and
ContentRenderFrameHostInterfaceRegistrar. I don't actually know what the
difference is at all, and it's not clear why there are 3 different types of
registrations.

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

The 3 different types are just for clients that require different arguments. For
example, I originally only needed an ApplicationContext so I was registering in
ContentContextInterfaceRegistrar, but then I realised I needed the RFH so I
moved it here.

I can add comments, but this really should be done in a separate CL because
there are a number of similar files to this (one in chrome/ for example) and it
doesn't make sense to be commenting those other files in this same (already
gigantic) CL.

[dcheng, 2017/03/22 01:23:26]

Sure, followup CL is fine. It's just hard for a non-Java person to understand
what the difference is between these (especially ContextRegistrar) and if there
are lifetime differences.

+            implements InterfaceRegistrar<RenderFrameHost> {
+        @Override
+        public void registerInterfaces(
+                InterfaceRegistry registry, final RenderFrameHost renderFrameHost) {
+            registry.addInterface(
+                    InstalledAppProvider.MANAGER, new InstalledAppProviderFactory(renderFrameHost));
+        }
+    }
 }