Dont set SwapInterval with Surfaceless.

EglSwapInterval doesn't take any effect when using a Surfacless
Context and will just return EGL_BAD_SURFACE in this case. This
patch adds checks to track if the current context is surfaceless
and ignores swap interval call in that case.

Tested by building Chromium with ChromesOS and
Ozone builds options and by launching chromium with the
following run time options:
chrome --no-sandbox --ozone-platform=gbm --ozone-use-surfaceless

After this change, I don't see any more EGL error as result of setting the SwapInterval
with surfaceless context during the launch time.
i.e. libEGL debug: EGL user error 0x300d (EGL_BAD_SURFACE) in eglSwapInterval

BUG=380861

Review URL: https://codereview.chromium.org/693313002

Cr-Commit-Position: refs/heads/master@{#302506}

ui/gl/gl_context_egl.cc

@@ -173,7 +173,13 @@ void* GLContextEGL::GetHandle() {
 }
 
 void GLContextEGL::SetSwapInterval(int interval) {
-  DCHECK(IsCurrent(NULL));
+  DCHECK(IsCurrent(NULL) && GLSurface::GetCurrent());
+
+  // This is a surfaceless context. eglSwapInterval doesn't take any effect in
+  // this case and will just return EGL_BAD_SURFACE.
+  if (GLSurface::GetCurrent()->IsSurfaceless())
+    return;
+
   if (!eglSwapInterval(display_, interval)) {
     LOG(ERROR) << "eglSwapInterval failed with error "
                << GetLastEGLErrorString();

ui/gl/gl_surface_egl.cc

@@ -682,6 +682,10 @@ bool SurfacelessEGL::IsOffscreen() {
   return true;
 }
 
+bool SurfacelessEGL::IsSurfaceless() const {
+  return true;
+}
+
 bool SurfacelessEGL::SwapBuffers() {
   LOG(ERROR) << "Attempted to call SwapBuffers with SurfacelessEGL.";
   return false;

ui/gl/gl_surface_egl.h

@@ -131,6 +131,7 @@ class GL_EXPORT SurfacelessEGL : public GLSurfaceEGL {
   bool Initialize() override;
   void Destroy() override;
   bool IsOffscreen() override;
+  bool IsSurfaceless() const override;
   bool SwapBuffers() override;
   gfx::Size GetSize() override;
   bool Resize(const gfx::Size& size) override;

ui/gl/gl_surface_ozone.cc

@@ -144,7 +144,6 @@ class GL_EXPORT GLSurfaceOzoneSurfaceless : public SurfacelessEGL {
     SwapBuffers();
     return true;
   }
-  virtual bool IsSurfaceless() const override { return true; }
 
  private:
   virtual ~GLSurfaceOzoneSurfaceless() {