Vulkan: fix vulkan external object broken with --use-vulkan=native

With the this change, the https://crbug.com/1014236 will not be
reproducible with Nvidia.

Bug: 1014236
Change-Id: If6a82f7e797bca2c726359575a2134f206ae72fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879749
Commit-Queue: Peng Huang <penghuang@chromium.org>
Commit-Queue: Vasiliy Telezhnikov <vasilyt@chromium.org>
Auto-Submit: Peng Huang <penghuang@chromium.org>
Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709180}

gpu/command_buffer/service/shared_context_state.cc

@@ -254,11 +254,15 @@ bool SharedContextState::InitializeGL(
     MakeCurrent(nullptr);
   }
 
+  bool is_native_vulkan =
+      gpu_preferences.use_vulkan == gpu::VulkanImplementationName::kNative ||
+      gpu_preferences.use_vulkan ==
+          gpu::VulkanImplementationName::kForcedNative;
+
   // Swiftshader GL and Vulkan report supporting external objects extensions,
   // but they don't.
   support_vulkan_external_object_ =
-      !gl::g_current_gl_version->is_swiftshader &&
-      gpu_preferences.use_vulkan == gpu::VulkanImplementationName::kNative &&
+      !gl::g_current_gl_version->is_swiftshader && is_native_vulkan &&
       gl::g_current_gl_driver->ext.b_GL_EXT_memory_object_fd &&
       gl::g_current_gl_driver->ext.b_GL_EXT_semaphore_fd;