Use GpuPreferences to avoid directly accessing switches in gpu related code

gpu/gles2_conform_support/egl/display.h

Index: gpu/gles2_conform_support/egl/display.h
diff --git a/gpu/gles2_conform_support/egl/display.h b/gpu/gles2_conform_support/egl/display.h
index 619fed9f10d5864f8f7791af9d69300df696f12c..02f1330fbbb89a4a969c4255cef749ab2924216b 100644
--- a/gpu/gles2_conform_support/egl/display.h
+++ b/gpu/gles2_conform_support/egl/display.h
@@ -15,6 +15,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
+#include "gpu/command_buffer/service/gpu_preferences.h"
 
 namespace egl {
 
@@ -73,6 +74,9 @@ class Display {
   EGLBoolean ReleaseCurrent(ThreadState*);
   EGLBoolean MakeCurrent(ThreadState*, EGLSurface, EGLSurface, EGLContext);
 
+  const gpu::GpuPreferences& gpu_preferences() const {
+    return gpu_preferences_;
+  }
   uint64_t GenerateFenceSyncRelease();
   bool IsFenceSyncRelease(uint64_t release);
   bool IsFenceSyncFlushed(uint64_t release);
@@ -85,6 +89,7 @@ class Display {
   Context* GetContext(EGLContext);
 
   base::Lock lock_;
+  gpu::GpuPreferences gpu_preferences_;
   bool is_initialized_;
   uint64_t next_fence_sync_release_;
   std::vector<scoped_refptr<Surface>> surfaces_;