Add chrome.webstore API methods to allow sites to see progress of installation

chrome/renderer/resources/extensions/webstore_custom_bindings.js

Index: chrome/renderer/resources/extensions/webstore_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/webstore_custom_bindings.js b/chrome/renderer/resources/extensions/webstore_custom_bindings.js
index 963adaa1da3a04822a7a8bb382c33b64cb4900a3..d4e70f55de08233b2f14bcc777b6623161fce938 100644
--- a/chrome/renderer/resources/extensions/webstore_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/webstore_custom_bindings.js
@@ -8,12 +8,19 @@ var webstoreNatives = requireNative('webstore');
 
 function Installer() {
   this._pendingInstall = null;
+  this._installStageListener = null;
+  this._downloadProgressListener = null;
 }
 
 Installer.prototype.install = function(url, onSuccess, onFailure) {
   if (this._pendingInstall)
     throw 'A Chrome Web Store installation is already pending.';
-  var installId = webstoreNatives.Install(url, onSuccess, onFailure);
+  var installId = webstoreNatives.Install(
+      this._installStageListener != null,
+      this._downloadProgressListener != null,
+      url,
+      onSuccess,
+      onFailure);
   if (installId !== undefined) {
     this._pendingInstall = {
       installId: installId,
@@ -43,20 +50,64 @@ Installer.prototype.onInstallResponse = function(installId, success, error) {
   }
 };
 
+Installer.prototype.setInstallStageListener = function(callback) {
+  if (webstoreNatives.ValidateInstallStageListener(callback))
+    this._installStageListener = callback;
+};
+
+Installer.prototype.onInstallStageChanged = function(installStage) {
+  if (!this._installStageListener)
+    return;  // This could happen if we removed the listener mid-flight.
+
+  try {
+    this._installStageListener(installStage);
+  } catch (e) {
+    console.error('Exception in listener set by ' +
+                  'chrome.webstore.setInstallStageListener: ' +
+                  e.message + ', ' + e.stack);
+  }
+};
+
+Installer.prototype.setDownloadProgressListener = function(callback) {
+  if (webstoreNatives.ValidateDownloadProgressListener(callback))
+    this._downloadProgressListener = callback;
+};
+
+Installer.prototype.onDownloadProgress = function(progress) {
+  if (!this._downloadProgressListener)
+    return;  // This could happen if we removed the listener mid-flight.
+
+  try {
+    this._downloadProgressListener(progress);
+  } catch (e) {
+    console.error('Exception in listener set by ' +
+                  'chrome.webstore.setDownloadProgressListener: ' +
+                  e.message + ', ' + e.stack);
+  }
+};
+
 var installer = new Installer();
 
 var chromeWebstore = {
-  install: function install(url, onSuccess, onFailure) {
+  install: function (url, onSuccess, onFailure) {
     installer.install(url, onSuccess, onFailure);
+  },
+  setInstallStageListener: function (callback) {
+    installer.setInstallStageListener(callback);
+  },
+  setDownloadProgressListener: function (callback) {
+    installer.setDownloadProgressListener(callback);
   }
 };
 
-// Called by webstore_binding.cc.
-function onInstallResponse(installId, success, error) {
-  installer.onInstallResponse(installId, success, error);
-}
-
-// These must match the names in InstallWebstorebinding in
+// This must match the name in InstallWebstoreBindings in
 // chrome/renderer/extensions/dispatcher.cc.
 exports.chromeWebstore = chromeWebstore;
-exports.onInstallResponse = onInstallResponse;
+
+// Called by webstore_binding.cc.
+exports.onInstallResponse =
+    Installer.prototype.onInstallResponse.bind(installer);
+exports.onInstallStageChanged =
+    Installer.prototype.onInstallStageChanged.bind(installer);
+exports.onDownloadProgress =
+    Installer.prototype.onDownloadProgress.bind(installer);