Adds a do-nothing ozone platform

ui/ozone/platform/test/ozone_platform_test.cc

Index: ui/ozone/platform/test/ozone_platform_test.cc
diff --git a/ui/ozone/platform/test/ozone_platform_test.cc b/ui/ozone/platform/test/ozone_platform_test.cc
index b35597f8e8e276da162b3bb2409a0065a1e08fa3..755d429733d670c00a3ec0ae9c31a6bc771d0a58 100644
--- a/ui/ozone/platform/test/ozone_platform_test.cc
+++ b/ui/ozone/platform/test/ozone_platform_test.cc
@@ -6,7 +6,6 @@
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
-#include "ui/events/ozone/device/device_manager.h"
 #include "ui/ozone/platform/test/test_cursor_factory.h"
 #include "ui/ozone/platform/test/test_event_factory.h"
 #include "ui/ozone/platform/test/test_window.h"
@@ -70,20 +69,22 @@ class OzonePlatformTest : public OzonePlatform {
 #endif
 
   virtual void InitializeUI() OVERRIDE {
-    device_manager_ = CreateDeviceManager();
     window_manager_.reset(new TestWindowManager(file_path_));
     window_manager_->Initialize();
     event_factory_ozone_.reset(new TestEventFactory());
+    if (file_path_.empty())

[alexst (slow to review), 2014/07/31 02:27:24]

Is there a particular reason you chose to skip the factories below?

I am not convinced this is safe to do because call-sites elsewhere in chrome
assume factories are not null.

[dnicoara, 2014/07/31 02:51:31]

From personal experience, the following factories will be required.

[varkha, 2014/08/07 00:17:10]

Acknowledged.

[varkha, 2014/08/07 00:17:10]

Done.

+      return;
     cursor_factory_ozone_.reset(new TestCursorFactory());
     gpu_platform_support_host_.reset(CreateStubGpuPlatformSupportHost());
   }
 
   virtual void InitializeGPU() OVERRIDE {
+    if (file_path_.empty())
+      return;
     gpu_platform_support_.reset(CreateStubGpuPlatformSupport());
   }
 
  private:
-  scoped_ptr<DeviceManager> device_manager_;
   scoped_ptr<TestWindowManager> window_manager_;
   scoped_ptr<TestEventFactory> event_factory_ozone_;
   scoped_ptr<CursorFactoryOzone> cursor_factory_ozone_;
@@ -98,7 +99,7 @@ class OzonePlatformTest : public OzonePlatform {
 
 OzonePlatform* CreateOzonePlatformTest() {
   CommandLine* cmd = CommandLine::ForCurrentProcess();
-  base::FilePath location = base::FilePath("/dev/null");
+  base::FilePath location;
   if (cmd->HasSwitch(switches::kOzoneDumpFile))
     location = cmd->GetSwitchValuePath(switches::kOzoneDumpFile);
   return new OzonePlatformTest(location);