exo: Avoid creating GLContext in motion event client unless needed.

components/exo/wayland/clients/motion_events.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Implementation of a client that produces output in the form of RGBA
 // buffers when receiving pointer/touch events. RGB contains the lower
 // 24 bits of the event timestamp and A is 0xff.
 
 #include <fcntl.h>
 #include <linux-dmabuf-unstable-v1-client-protocol.h>
@@ skipping 352 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(MotionEvents);
 };
 
 int MotionEvents::Run() {
   display_.reset(wl_display_connect(nullptr));
   if (!display_) {
     LOG(ERROR) << "wl_display_connect failed";
     return 1;
   }
 
-  bool gl_initialized = gl::init::InitializeGLOneOff();
-  DCHECK(gl_initialized);
-  gl_surface_ = gl::init::CreateOffscreenGLSurface(gfx::Size());
-  gl_context_ =
-      gl::init::CreateGLContext(nullptr,  // share_group
-                                gl_surface_.get(), gl::GLContextAttribs());
-
-  make_current_.reset(
-      new ui::ScopedMakeCurrent(gl_context_.get(), gl_surface_.get()));
-
   wl_registry_listener registry_listener = {RegistryHandler, RegistryRemover};
 
   wl_registry* registry = wl_display_get_registry(display_.get());
   wl_registry_add_listener(registry, &registry_listener, &globals_);
 
   wl_display_roundtrip(display_.get());
 
   if (!globals_.compositor) {
     LOG(ERROR) << "Can't find compositor interface";
     return 1;
@@ skipping 46 matching lines @@
       LOG_IF(ERROR, !use_drm_) << "Can't find drm device";
       return 1;
     }
 
     device_.reset(gbm_create_device(drm_fd_.get()));
     if (!device_) {
       LOG(ERROR) << "Can't create gbm device";
       return 1;
     }
 
+    bool gl_initialized = gl::init::InitializeGLOneOff();
+    DCHECK(gl_initialized);
+    gl_surface_ = gl::init::CreateOffscreenGLSurface(gfx::Size());
+    gl_context_ =
+        gl::init::CreateGLContext(nullptr,  // share_group
+                                  gl_surface_.get(), gl::GLContextAttribs());
+
+    make_current_.reset(
+        new ui::ScopedMakeCurrent(gl_context_.get(), gl_surface_.get()));
+
     if (gl::GLSurfaceEGL::HasEGLExtension("EGL_EXT_image_flush_external") ||
         gl::GLSurfaceEGL::HasEGLExtension("EGL_ARM_implicit_external_sync")) {
       egl_sync_type = EGL_SYNC_FENCE_KHR;
     }
     if (gl::GLSurfaceEGL::HasEGLExtension("EGL_ANDROID_native_fence_sync")) {
       egl_sync_type = EGL_SYNC_NATIVE_FENCE_ANDROID;
     }
   }
 
   sk_sp<const GrGLInterface> native_interface(GrGLCreateNativeInterface());
@@ skipping 440 matching lines @@
         new std::string(command_line->GetSwitchValueASCII(switches::kUseDrm)));
   }
 
   exo::wayland::clients::MotionEvents client(
       width, height, scale, num_rects, max_frames_pending,
       command_line->HasSwitch(switches::kFullscreen),
       command_line->HasSwitch(switches::kShowFpsCounter), num_benchmark_runs,
       base::TimeDelta::FromMilliseconds(benchmark_interval_ms), use_drm.get());
   return client.Run();
 }