command_buffer: correctly use glGetFramebufferAttachmentParameter

gpu/command_buffer/service/framebuffer_manager.cc

Index: gpu/command_buffer/service/framebuffer_manager.cc
diff --git a/gpu/command_buffer/service/framebuffer_manager.cc b/gpu/command_buffer/service/framebuffer_manager.cc
index 04f05f6c89a02e14a3c148937a7cfe8c48f19c59..0c5d96708e856d8e9c3d8578eb785c9f2d18c71e 100644
--- a/gpu/command_buffer/service/framebuffer_manager.cc
+++ b/gpu/command_buffer/service/framebuffer_manager.cc
@@ -552,6 +552,10 @@ void Framebuffer::MarkAttachmentsAsCleared(
   }
 }
 
+bool Framebuffer::HasColorAttachment(int index) const {
+  return attachments_.find(GL_COLOR_ATTACHMENT0 + index) != attachments_.end();
+}
+
 bool Framebuffer::HasDepthAttachment() const {
   return attachments_.find(GL_DEPTH_STENCIL_ATTACHMENT) != attachments_.end() ||
          attachments_.find(GL_DEPTH_ATTACHMENT) != attachments_.end();