Support userAgent overriding for guests.

Following methods are implemented:
<webview>.setUserAgentOverride(string);
<webview>.getUserAgent();
bool <webview>.isUserAgentOverridden();

Usage:
webviewElement.setUserAgentOverride('...');
webviewElement.setAttribute('src', '...);


BUG=275949
Test=Added WebViewTest.UserAgent, for use case, see Usage above.

Review URL: https://codereview.chromium.org/19267003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225301 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 39 insertions, 3 deletions

diff --git a/chrome/renderer/resources/extensions/web_view.js b/chrome/renderer/resources/extensions/web_view.js
index ff785e9..a14c351 100644
--- a/chrome/renderer/resources/extensions/web_view.js
+++ b/chrome/renderer/resources/extensions/web_view.js
@@ -558,6 +558,9 @@ WebViewInternal.prototype.setupWebviewNodeEvents_ = function() {
       'api': 'webview',
       'instanceId': self.viewInstanceId_
     };
+    if (self.userAgentOverride_) {
+      params['userAgentOverride'] = self.userAgentOverride_;
+    }
     self.browserPluginNode_['-internal-attach'](params);
 
     var events = self.getEvents_();
diff --git a/chrome/renderer/resources/extensions/web_view_experimental.js b/chrome/renderer/resources/extensions/web_view_experimental.js
index afa20b11..ee8f089 100644
--- a/chrome/renderer/resources/extensions/web_view_experimental.js
+++ b/chrome/renderer/resources/extensions/web_view_experimental.js
@@ -113,13 +113,12 @@ WebViewInternal.prototype.handleDialogEvent_ =
   }
 };
 
-/**
- * @private
- */
+/** @private */
 WebViewInternal.prototype.maybeGetExperimentalEvents_ = function() {
   return WEB_VIEW_EXPERIMENTAL_EVENTS;
 };
 
+/** @private */
 WebViewInternal.prototype.clearData_ = function(var_args) {
   if (!this.instanceId_) {
     return;
@@ -128,9 +127,43 @@ WebViewInternal.prototype.clearData_ = function(var_args) {
   $Function.apply(WebView.clearData, null, args);
 };
 
+/** @private */
+WebViewInternal.prototype.getUserAgent_ = function() {
+  return this.userAgentOverride_ || navigator.userAgent;
+};
+
+/** @private */
+WebViewInternal.prototype.isUserAgentOverridden_ = function() {
+  return !!this.userAgentOverride_ &&
+      this.userAgentOverride_ != navigator.userAgent;
+};
+
+/** @private */
+WebViewInternal.prototype.setUserAgentOverride_ = function(userAgentOverride) {
+  this.userAgentOverride_ = userAgentOverride;
+  if (!this.instanceId_) {
+    // If we are not attached yet, then we will pick up the user agent on
+    // attachment.
+    return;
+  }
+  WebView.overrideUserAgent(this.instanceId_, userAgentOverride);
+};
+
 WebViewInternal.maybeRegisterExperimentalAPIs = function(proto, secret) {
   proto.clearData = function(var_args) {
     var internal = this.internal_(secret);
     $Function.apply(internal.clearData_, internal, arguments);
   };
+
+  proto.getUserAgent = function() {
+    return this.internal_(secret).getUserAgent_();
+  };
+
+  proto.isUserAgentOverridden = function() {
+    return this.internal_(secret).isUserAgentOverridden_();
+  };
+
+  proto.setUserAgentOverride = function(userAgentOverride) {
+    this.internal_(secret).setUserAgentOverride_(userAgentOverride);
+  };
 };