Adds a do-nothing ozone platform

ui/ozone/platform/test/test_window_manager.cc

Index: ui/ozone/platform/test/test_window_manager.cc
diff --git a/ui/ozone/platform/test/test_window_manager.cc b/ui/ozone/platform/test/test_window_manager.cc
index 8e6e4b02b1a0e3640618e9d1ff03e3b2fdcfa193..e84297c3ea884b89aa4c68164132004dd8bd212d 100644
--- a/ui/ozone/platform/test/test_window_manager.cc
+++ b/ui/ozone/platform/test/test_window_manager.cc
@@ -21,6 +21,7 @@ namespace ui {
 namespace {
 
 void WriteDataToFile(const base::FilePath& location, const SkBitmap& bitmap) {
+  DCHECK(!location.empty());
   std::vector<unsigned char> png_data;
   gfx::PNGCodec::FastEncodeBGRASkBitmap(bitmap, true, &png_data);
   base::WriteFile(location,
@@ -42,6 +43,8 @@ class FileSurface : public SurfaceOzoneCanvas {
     return skia::SharePtr(surface_->getCanvas());
   }
   virtual void PresentCanvas(const gfx::Rect& damage) OVERRIDE {
+    if (location_.empty())
+      return;
     SkBitmap bitmap;
     bitmap.setInfo(surface_->getCanvas()->imageInfo());
 
@@ -71,6 +74,8 @@ TestWindowManager::~TestWindowManager() {
 }
 
 void TestWindowManager::Initialize() {
+  if (location_.empty())
+    return;
   if (!DirectoryExists(location_) && !base::CreateDirectory(location_) &&
       location_ != base::FilePath("/dev/null"))
     PLOG(FATAL) << "unable to create output directory";
@@ -79,10 +84,14 @@ void TestWindowManager::Initialize() {
 }
 
 int32_t TestWindowManager::AddWindow(TestWindow* window) {
+  if (location_.empty())
+    return 1;
   return windows_.Add(window);
 }
 
 void TestWindowManager::RemoveWindow(int32_t window_id, TestWindow* window) {
+  if (location_.empty())
+    return;
   DCHECK_EQ(window, windows_.Lookup(window_id));
   windows_.Remove(window_id);
 }
@@ -93,6 +102,10 @@ base::FilePath TestWindowManager::base_path() const {
 
 scoped_ptr<SurfaceOzoneCanvas> TestWindowManager::CreateCanvasForWidget(
     gfx::AcceleratedWidget widget) {
+  if (location_.empty()) {

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

There is no reason to complicate the code with the if statements (modulo the one
in Initialize) since the end result is the same.

[spang, 2014/07/31 16:04:01]

I think we need the one in Initialize() and in PresentCanvas(). The rest are
probably not needed.

[dnicoara, 2014/07/31 16:09:23]

The one in CreateCanvasForWidget shouldn't be needed, window->path() returns an
empty path as well.

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

Acknowledged.

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

Done.

[varkha, 2014/08/07 00:17:11]

Done.

+    return make_scoped_ptr<SurfaceOzoneCanvas>(
+        new FileSurface(base::FilePath()));
+  }
   TestWindow* window = windows_.Lookup(widget);
   DCHECK(window);
   return make_scoped_ptr<SurfaceOzoneCanvas>(new FileSurface(window->path()));