Implemented ForceMaximizeBrowserWindowOnFirstRun policy, added unit test and browser test.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 43de89d014a89515cc03bd9dd0e55ce485edd87d..2abee8a02794564e28e39163c120418928265dcb 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -832,6 +832,8 @@ const char kTouchVirtualKeyboardEnabled[] = "ui.touch_virtual_keyboard_enabled";
 // A boolean pref that controls whether wake on SSID is enabled.
 const char kWakeOnWifiSsid[] = "settings.internet.wake_on_wifi_ssid";
 
+// This boolean controls if browser window is maximized on the first run.

[bartfab (slow), 2015/03/12 11:54:47]

Nit: How about:

"This boolean controls whether the first window shown on first run should be
unconditionally maximized, overriding the heuristic that normally chooses the
window size."

[peletskyi, 2015/03/18 13:28:13]

Done.

+const char kForceMaximizeBrowserWindowOnFirstRun[] = "ui.first_run_maximized";

[bartfab (slow), 2015/03/12 11:54:47]

Nit: How about s/first_run_maximized/force_maximize_on_first_run/ for
consistency?

[peletskyi, 2015/03/18 13:28:13]

Done.

 #endif  // defined(OS_CHROMEOS)
 
 // The disabled messages in IPC logging.