Wrote audio- and video-only WebRTC call tests.

chrome/browser/automation/testing_automation_provider.cc

 // Copyright 2012 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.
 
 #include "chrome/browser/automation/testing_automation_provider.h"
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 2240 matching lines @@
     MediaStreamInfoBarDelegate* media_stream_infobar;
     if (!(media_stream_infobar = infobar->AsMediaStreamInfoBarDelegate())) {
       reply.SendError("Not a media stream infobar.");
       return;
     }
     if ("allow" == action) {
       content::MediaStreamDevices video_devices =
           media_stream_infobar->GetVideoDevices();
       content::MediaStreamDevices audio_devices =
           media_stream_infobar->GetAudioDevices();
-      if (video_devices.empty() || audio_devices.empty()) {
-        reply.SendError("No available audio/video devices to autoselect.");
+

[phoglund_chromium, 2012/11/29 10:11:36]

HasVideo() == true -> web page actually requested video.

+      if (media_stream_infobar->HasVideo() && video_devices.empty()) {
+        reply.SendError("Requested video, but there are no video "
+                        "devices on the system.");
+        return;
+      }
+      if (media_stream_infobar->HasAudio() && audio_devices.empty()) {
+        reply.SendError("Requested audio, but there are no audio "
+            "devices on the system.");
         return;
       }
 
       media_stream_infobar->Accept();
       infobar_helper->RemoveInfoBar(infobar);
     } else if ("deny" == action) {
       media_stream_infobar->Deny();
       infobar_helper->RemoveInfoBar(infobar);
     }
     reply.SendSuccess(NULL);
@@ skipping 4078 matching lines @@
   if (g_browser_process)
     g_browser_process->GetAutomationProviderList()->RemoveProvider(this);
 }
 
 void TestingAutomationProvider::EnsureTabSelected(Browser* browser,
                                                   WebContents* tab) {
   TabStripModel* tab_strip = browser->tab_strip_model();
   if (tab_strip->GetActiveWebContents() != tab)
     tab_strip->ActivateTabAt(tab_strip->GetIndexOfWebContents(tab), true);
 }