Fix Bug 1496167 - Add installation source to addons installed from activitystream

lib/ASRouter.jsm

@@ -215,7 +215,12 @@ const MessageLoaderUtils = {
     try {
       const aUri = Services.io.newURI(url);
       const systemPrincipal = Services.scriptSecurityManager.getSystemPrincipal();
-      const install = await AddonManager.getInstallForURL(aUri.spec, "application/x-xpinstall");
+
+      // AddonManager installation source associated to the addons installed from activitystream
+      // (See Bug 1496167 for a rationale).
+      const amTelemetryInfo = {source: "activitystream"};
+      const install = await AddonManager.getInstallForURL(aUri.spec, "application/x-xpinstall", null,
+                                                          null, null, null, null, amTelemetryInfo);
       await AddonManager.installAddonFromWebpage("application/x-xpinstall", browser,
         systemPrincipal, install);
     } catch (e) {}

test/unit/asrouter/MessageLoaderUtils.test.js

@@ -252,6 +252,11 @@ describe("MessageLoaderUtils", () => {
 
       assert.calledOnce(getInstallStub);
       assert.calledOnce(installAddonStub);
+
+      // Verify that the expected installation source has been passed to the getInstallForURL
+      // method (See Bug 1496167 for a rationale).
+      assert.calledWithExactly(getInstallStub, "foo.com", "application/x-xpinstall", null,
+                               null, null, null, null, {source: "activitystream"});
     });
     it("should not call the Addons API on invalid URLs", async () => {
       sandbox.stub(global.Services.scriptSecurityManager, "getSystemPrincipal").throws();