Change user agent in TelemetryActivity in system webview shell for

perf testing with Extra String that comes with the intent

This is to fix one of the issues in android_webview_aosp_perf. Android
WebView doesn't support "--user-agent" commandline flag and it causing
some of the pages to reload in Telemetry tests.

BUG=554430

Review URL: https://codereview.chromium.org/1433193002

Cr-Commit-Position: refs/heads/master@{#360219}

android_webview/tools/WebViewShell/src/org/chromium/webview_shell/TelemetryActivity.java

@@ -5,8 +5,10 @@
 package org.chromium.webview_shell;
 
 import android.app.Activity;
+import android.content.Intent;
 import android.os.Bundle;
 import android.webkit.CookieManager;
+import android.webkit.WebSettings;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
 
@@ -24,7 +26,14 @@ public void onCreate(Bundle savedInstanceState) {
 
         WebView webView = (WebView) findViewById(R.id.webview);
         CookieManager.setAcceptFileSchemeCookies(true);
-        webView.getSettings().setJavaScriptEnabled(true);
+        WebSettings settings = webView.getSettings();
+        settings.setJavaScriptEnabled(true);
+
+        Intent intent = getIntent();
+        String userAgentString = intent.getStringExtra("userAgent");
+        if (userAgentString != null) {
+            settings.setUserAgentString(userAgentString);
+        }
 
         webView.setWebViewClient(new WebViewClient() {
                 @Override

tools/telemetry/telemetry/internal/backends/chrome/android_browser_backend.py

@@ -12,6 +12,7 @@
 from telemetry.internal.backends import android_command_line_backend
 from telemetry.internal.backends import browser_backend
 from telemetry.internal.backends.chrome import chrome_browser_backend
+from telemetry.internal.browser import user_agent
 from telemetry.internal import forwarders
 
 from devil.android.sdk import intent
@@ -99,13 +100,17 @@ def Start(self):
 
     self.platform_backend.DismissCrashDialogIfNeeded()
 
+    user_agent_dict = user_agent.GetChromeUserAgentDictFromType(
+        self.browser_options.browser_user_agent_type)
+
     browser_startup_args = self.GetBrowserStartupArgs()
     with android_command_line_backend.SetUpCommandLineFlags(
         self.device, self._backend_settings, browser_startup_args):
       self.device.StartActivity(
           intent.Intent(package=self._backend_settings.package,
                         activity=self._backend_settings.activity,
-                        action=None, data=url, category=None),
+                        action=None, data=url, category=None,
+                        extras=user_agent_dict),
           blocking=True)
 
       remote_devtools_port = self._backend_settings.GetDevtoolsRemotePort(

tools/telemetry/telemetry/internal/browser/user_agent.py

@@ -30,3 +30,8 @@ def GetChromeUserAgentArgumentFromType(user_agent_type):
   if user_agent_type:
     return ['--user-agent=%s' % UA_TYPE_MAPPING[user_agent_type]]
   return []
+
+def GetChromeUserAgentDictFromType(user_agent_type):
+  if user_agent_type:
+    return {'userAgent': UA_TYPE_MAPPING[user_agent_type]}
+  return ''