Get WebRTC resources on Android Testers.

build/android/buildbot/bb_host_steps.py

Index: build/android/buildbot/bb_host_steps.py
diff --git a/build/android/buildbot/bb_host_steps.py b/build/android/buildbot/bb_host_steps.py
index adb9ca0568a4f6d5020b9e4f1886eee0aeba56e6..e27ba08bbcc9b4265182acb9721821d66fe7c8c3 100755
--- a/build/android/buildbot/bb_host_steps.py
+++ b/build/android/buildbot/bb_host_steps.py
@@ -102,12 +102,19 @@ def BisectPerfRegression(_):
           '-w', os.path.join(constants.DIR_SOURCE_ROOT, os.pardir)])
 
 
+def DownloadWebRTCResources(_):
+  bb_annotations.PrintNamedStep('download_resources')
+  RunCmd([SrcPath('third_party', 'webrtc', 'tools', 'update_resources.py'),
+          '-p', '../../../'], halt_on_failure=True)
+
+
 def GetHostStepCmds():
   return [
       ('compile', Compile),
       ('extract_build', ExtractBuild),
       ('check_webview_licenses', CheckWebViewLicenses),
       ('bisect_perf_regression', BisectPerfRegression),
+      ('download_webrtc_resources', DownloadWebRTCResources),
       ('findbugs', FindBugs),
       ('zip_build', ZipBuild)
   ]