[content shell] Add layout test specific font setup (for linux only right now)

content/shell/shell_main_delegate.cc

Index: content/shell/shell_main_delegate.cc
diff --git a/content/shell/shell_main_delegate.cc b/content/shell/shell_main_delegate.cc
index 35a9350be74dec5d359d8529ac6e7f3cf34107fa..e8bbacdf37946a7e8faa76d64ba418dfb73fb73d 100644
--- a/content/shell/shell_main_delegate.cc
+++ b/content/shell/shell_main_delegate.cc
@@ -15,6 +15,7 @@
 #include "content/shell/shell_content_browser_client.h"
 #include "content/shell/shell_content_renderer_client.h"
 #include "content/shell/shell_switches.h"
+#include "content/shell/webkit_test_platform_support.h"
 #include "net/cookies/cookie_monster.h"
 #include "net/http/http_stream_factory.h"
 #include "ui/base/resource/resource_bundle.h"
@@ -93,6 +94,11 @@ bool ShellMainDelegate::BasicStartupComplete(int* exit_code) {
         switches::kForceCompositingMode);
     //net::HttpStreamFactory::set_ignore_certificate_errors(true);
     net::CookieMonster::EnableFileScheme();
+    if (!WebKitTestPlatformInitialize()) {
+      if (exit_code)
+        *exit_code = 1;
+      return true;
+    }
   }
   SetContentClient(&content_client_);
   return false;