Move GLSurface creation from //ui/gl to //ui/gl/init.

ui/gl/init/gl_factory_mac.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.
 
 #include "ui/gl/init/gl_factory.h"
 
 #include "base/logging.h"
+#include "base/macros.h"
 #include "base/trace_event/trace_event.h"
+#include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context_cgl.h"
 #include "ui/gl/gl_context_osmesa.h"
 #include "ui/gl/gl_context_stub.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_share_group.h"
 #include "ui/gl/gl_surface.h"
+#include "ui/gl/gl_surface_osmesa.h"
+#include "ui/gl/gl_surface_stub.h"
 
 namespace gl {
 namespace init {
 
+namespace {
+
+// A "no-op" surface. It is not required that a CGLContextObj have an
+// associated drawable (pbuffer or fullscreen context) in order to be
+// made current. Everywhere this surface type is used, we allocate an
+// FBO at the user level as the drawable of the associated context.
+class NoOpGLSurface : public GLSurface {
+ public:
+  explicit NoOpGLSurface(const gfx::Size& size) : size_(size) {}
+
+  // Implement GLSurface.
+  bool Initialize(GLSurface::Format format) override { return true; }
+  void Destroy() override {}
+  bool IsOffscreen() override { return true; }
+  gfx::SwapResult SwapBuffers() override {
+    NOTREACHED() << "Cannot call SwapBuffers on a NoOpGLSurface.";
+    return gfx::SwapResult::SWAP_FAILED;
+  }
+  gfx::Size GetSize() override { return size_; }
+  void* GetHandle() override { return nullptr; }
+  void* GetDisplay() override { return nullptr; }
+  bool IsSurfaceless() const override { return true; }
+
+ protected:
+  ~NoOpGLSurface() override {}
+
+ private:
+  gfx::Size size_;
+
+  DISALLOW_COPY_AND_ASSIGN(NoOpGLSurface);
+};
+
+}  // namespace
+
 scoped_refptr<GLContext> CreateGLContext(GLShareGroup* share_group,
                                          GLSurface* compatible_surface,
                                          GpuPreference gpu_preference) {
   TRACE_EVENT0("gpu", "gl::init::CreateGLContext");
   switch (GetGLImplementation()) {
     case kGLImplementationDesktopGL:
     case kGLImplementationDesktopGLCoreProfile:
     case kGLImplementationAppleGL:
       // Note that with virtualization we might still be able to make current
       // a different onscreen surface with this context later. But we should
       // always be creating the context with an offscreen surface first.
       DCHECK(compatible_surface->IsOffscreen());
       return InitializeGLContext(new GLContextCGL(share_group),
                                  compatible_surface, gpu_preference);
     case kGLImplementationOSMesaGL:
       return InitializeGLContext(new GLContextOSMesa(share_group),
                                  compatible_surface, gpu_preference);
     case kGLImplementationMockGL:
       return new GLContextStub(share_group);
     default:
       NOTREACHED();
       return nullptr;
   }
 }
 
+scoped_refptr<GLSurface> CreateViewGLSurface(gfx::AcceleratedWidget window) {
+  TRACE_EVENT0("gpu", "gl::init::CreateViewGLSurface");
+  switch (GetGLImplementation()) {
+    case kGLImplementationDesktopGL:
+    case kGLImplementationDesktopGLCoreProfile:
+    case kGLImplementationAppleGL: {
+      NOTIMPLEMENTED() << "No onscreen support on Mac.";
+      return nullptr;
+    }
+    case kGLImplementationOSMesaGL: {
+      return InitializeGLSurface(new GLSurfaceOSMesaHeadless());
+    }
+    case kGLImplementationMockGL:
+      return new GLSurfaceStub;
+    default:
+      NOTREACHED();
+      return nullptr;
+  }
+}
+
+scoped_refptr<GLSurface> CreateOffscreenGLSurface(const gfx::Size& size) {
+  TRACE_EVENT0("gpu", "gl::init::CreateOffscreenGLSurface");
+  switch (GetGLImplementation()) {
+    case kGLImplementationOSMesaGL:
+      return InitializeGLSurface(
+          new GLSurfaceOSMesa(GLSurface::SURFACE_OSMESA_RGBA, size));
+    case kGLImplementationDesktopGL:
+    case kGLImplementationDesktopGLCoreProfile:
+    case kGLImplementationAppleGL:
+      return InitializeGLSurface(new NoOpGLSurface(size));
+    case kGLImplementationMockGL:
+      return new GLSurfaceStub;
+    default:
+      NOTREACHED();
+      return nullptr;
+  }
+}
+
 }  // namespace init
 }  // namespace gl