Implemented ForceMaximizeBrowserWindowOnFirstRun policy, added unit test and browser test.

ash/shell/shell_delegate_impl.cc

Index: ash/shell/shell_delegate_impl.cc
diff --git a/ash/shell/shell_delegate_impl.cc b/ash/shell/shell_delegate_impl.cc
index dc081c6fc359aba744fdf4c1c1020099b65bc638..74ad5a8928c640eeb319e902820c9f8e8bd8d668 100644
--- a/ash/shell/shell_delegate_impl.cc
+++ b/ash/shell/shell_delegate_impl.cc
@@ -181,6 +181,10 @@ bool ShellDelegateImpl::IsMultiAccountEnabled() const {
   return false;
 }
 
+bool ShellDelegateImpl::IsFirstTimeMaximized() const {
+  return true;

[bartfab (slow), 2015/03/12 11:54:43]

Nit: This dummy delegate should return the default setting, which is |false| in
this case.

[peletskyi, 2015/03/18 13:28:09]

Done.

+}
+
 void ShellDelegateImpl::PreInit() {
 }