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

ui/gl/gl_surface_egl.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.
 
 // This include must be here so that the includes provided transitively
 // by gl_surface_egl.h don't make it impossible to compile this code.
 #include "third_party/mesa/src/include/GL/osmesa.h"
 
 #include "ui/gl/gl_surface_egl.h"
 
@@ skipping 471 matching lines @@
 #endif
 }
 
 void NativeViewGLSurfaceEGL::SetHandle(EGLSurface surface) {
   surface_ = surface;
 }
 
 PbufferGLSurfaceEGL::PbufferGLSurfaceEGL(const gfx::Size& size)
     : size_(size),
       surface_(NULL) {
+  // Some implementations of Pbuffer do not support having a 0 size. For such
+  // cases use a (1, 1) surface.
+  if (size_.GetArea() == 0)
+    size_.SetSize(1, 1);
 }
 
 bool PbufferGLSurfaceEGL::Initialize() {
   EGLSurface old_surface = surface_;
 
   EGLDisplay display = GetDisplay();
   if (!display) {
     LOG(ERROR) << "Trying to create surface with invalid display.";
     return false;
   }
 
-  if (size_.GetArea() == 0) {
-    LOG(ERROR) << "Error: surface has zero area "
-               << size_.width() << " x " << size_.height();
-    return false;
-  }
-
   // Allocate the new pbuffer surface before freeing the old one to ensure
   // they have different addresses. If they have the same address then a
   // future call to MakeCurrent might early out because it appears the current
   // context and surface have not changed.
   const EGLint pbuffer_attribs[] = {
     EGL_WIDTH, size_.width(),
     EGL_HEIGHT, size_.height(),
     EGL_NONE
   };
 
@@ skipping 132 matching lines @@
 }
 
 void* SurfacelessEGL::GetShareHandle() {
   return NULL;
 }
 
 SurfacelessEGL::~SurfacelessEGL() {
 }
 
 }  // namespace gfx