Updating calls to offscreen buffers to use a size of (0,0) when they do not require an actual buffer

ui/gl/gl_surface_osmesa.cc

 // Copyright (c) 2012 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 "base/logging.h"
 #include "third_party/mesa/src/include/GL/osmesa.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_surface_osmesa.h"
 #include "ui/gl/scoped_make_current.h"
 
 namespace gfx {
 
 GLSurfaceOSMesa::GLSurfaceOSMesa(unsigned format, const gfx::Size& size)
     : format_(format),
       size_(size) {
+  // Implementations of OSMesa surface do not support having a 0 size. In such
+  // cases use a (1, 1) surface.
+  if (size_.GetArea() == 0)
+    size_.SetSize(1, 1);
 }
 
 bool GLSurfaceOSMesa::Initialize() {
   return Resize(size_);
 }
 
 void GLSurfaceOSMesa::Destroy() {
   buffer_.reset();
 }
 
@@ skipping 59 matching lines @@
 bool GLSurfaceOSMesaHeadless::IsOffscreen() { return false; }
 
 bool GLSurfaceOSMesaHeadless::SwapBuffers() { return true; }
 
 GLSurfaceOSMesaHeadless::GLSurfaceOSMesaHeadless()
     : GLSurfaceOSMesa(OSMESA_BGRA, gfx::Size(1, 1)) {}
 
 GLSurfaceOSMesaHeadless::~GLSurfaceOSMesaHeadless() { Destroy(); }
 
 }  // namespace gfx