When rendering offscreen, prefer size 0 instead of 1.

services/gles2/command_buffer_driver.cc

Index: services/gles2/command_buffer_driver.cc
diff --git a/services/gles2/command_buffer_driver.cc b/services/gles2/command_buffer_driver.cc
index 6ba980f01fc3b7ca8047bf088ec6e4ce1b891fe1..4720bf695165357f9b0dd7746131ccd36acc9950 100644
--- a/services/gles2/command_buffer_driver.cc
+++ b/services/gles2/command_buffer_driver.cc
@@ -99,10 +99,17 @@ void CommandBufferDriver::Initialize(
 
 bool CommandBufferDriver::DoInitialize(
     mojo::ScopedSharedBufferHandle shared_state) {
-  if (widget_ == gfx::kNullAcceleratedWidget)
+  if (widget_ == gfx::kNullAcceleratedWidget) {
+    // This is a dummy surface, so attempt to skip actual surface
+    // allocation by passing size 0.
     surface_ = gfx::GLSurface::CreateOffscreenGLSurface(
-        gfx::Size(1, 1), requested_configuration_);
-  else {
+        gfx::Size(0, 0), requested_configuration_);
+    if (!surface_.get()) {
+      // If size 0 was a fail, retry with size 1.
+      surface_ = gfx::GLSurface::CreateOffscreenGLSurface(
+          gfx::Size(1, 1), requested_configuration_);
+    }
+  } else {
     surface_ =
         gfx::GLSurface::CreateViewGLSurface(widget_, requested_configuration_);
     if (auto vsync_provider = surface_->GetVSyncProvider()) {