Implemented ForceMaximizeBrowserWindowOnFirstRun policy, added unit test and browser test.

chrome/browser/ui/ash/chrome_shell_delegate.cc

Index: chrome/browser/ui/ash/chrome_shell_delegate.cc
diff --git a/chrome/browser/ui/ash/chrome_shell_delegate.cc b/chrome/browser/ui/ash/chrome_shell_delegate.cc
index 88998525db8117bb5342cdda7a63554ce6da4a56..de4e946e67a24522b2462e0c12b29833a24c348e 100644
--- a/chrome/browser/ui/ash/chrome_shell_delegate.cc
+++ b/chrome/browser/ui/ash/chrome_shell_delegate.cc
@@ -7,6 +7,7 @@
 #include "ash/content_support/gpu_support_impl.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_util.h"
+#include "base/prefs/pref_service.h"
 #include "chrome/browser/app_mode/app_mode_utils.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/profiles/profile_manager.h"
@@ -17,6 +18,7 @@
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_controller.h"
 #include "chrome/browser/ui/ash/launcher/launcher_context_menu.h"
 #include "chrome/browser/ui/browser_commands.h"
+#include "chrome/common/pref_names.h"
 #include "chrome/grit/chromium_strings.h"
 #include "components/signin/core/common/profile_management_switches.h"
 #include "ui/base/l10n/l10n_util.h"
@@ -88,6 +90,16 @@ bool ChromeShellDelegate::IsMultiAccountEnabled() const {
   return false;
 }
 
+bool ChromeShellDelegate::IsFirstTimeMaximized() const {
+#if defined(OS_CHROMEOS)
+  if (ProfileManager::GetActiveUserProfile()) {

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

The documentation for this method says that you should "avoid using it at all
cost" :). It is also states that for guest, you will get a "suitable" profile,
whatever that may mean. I think a better implementation is:

const user_manager::User* const user =
    user_manager::UserManager::Get()->GetActiveUser();
if (!user)
  return false;
return chromeos::ProfileHelper::Get()->GetProfileByUser(user)->
    GetPrefs()->GetBoolean(prefs::kForceMaximizeBrowserWindowOnFirstRun);

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

Done.

+    return ProfileManager::GetActiveUserProfile()->GetPrefs()->GetBoolean(

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

Nit: #include "chrome/browser/profiles/profile.h"

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

Done.

+        prefs::kForceMaximizeBrowserWindowOnFirstRun);
+  }
+#endif
+  return false;
+}
+
 void ChromeShellDelegate::Exit() {
   chrome::AttemptUserExit();
 }