[Ozone] Initialize SurfaceFactoryOzone only in the EGL GLES2 case

aura_unittests explicitly calls GLSurface::InitializeOneOffForTests in main().
The Ozone platform isn't initialized this early causing a CHECK failure when
trying to get SurfaceFactoryOzone.

At this point surface creation in unittests is handled by OSMesa, thus we don't
need SurfaceFactoryOzone initialized.

TBR=piman@chromium.org
NOTRY=true

TESTS=Ran aura_unittests manually using an Ozone build

Review URL: https://codereview.chromium.org/217003007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@260239 0039d316-1c4b-4281-b951-d872f2087c98

ui/gl/gl_surface_ozone.cc

@@ -17,14 +17,14 @@ namespace gfx {
 
 // static
 bool GLSurface::InitializeOneOffInternal() {
-  if (gfx::SurfaceFactoryOzone::GetInstance()->InitializeHardware() !=
-      gfx::SurfaceFactoryOzone::INITIALIZED) {
-    LOG(ERROR) << "Ozone failed to initialize hardware";
-    return false;
-  }
-
   switch (GetGLImplementation()) {
     case kGLImplementationEGLGLES2:
+      if (gfx::SurfaceFactoryOzone::GetInstance()->InitializeHardware() !=
+          gfx::SurfaceFactoryOzone::INITIALIZED) {
+        LOG(ERROR) << "Ozone failed to initialize hardware";
+        return false;
+      }
+
       if (!GLSurfaceEGL::InitializeOneOff()) {
         LOG(ERROR) << "GLSurfaceEGL::InitializeOneOff failed.";
         return false;