[Command buffer] workaround the framebuffer completeness bug for Intel Mac

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 8be63b095c41b3833ddc5b4f8029d28cf47203c0..c54c410d09f45e30dfc9d7d3cbba2c4f899631d4 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -7542,6 +7542,29 @@ GLenum GLES2DecoderImpl::DoCheckFramebufferStatus(GLenum target) {
   if (completeness != GL_FRAMEBUFFER_COMPLETE) {
     return completeness;
   }
+
+  if (workarounds().adjust_framebuffer_complete_status &&
+      SupportsDrawBuffers()) {
+    switch (target) {
+      case GL_READ_FRAMEBUFFER:
+        if (framebuffer->ReadBufferHasNoImage() &&
+            framebuffer->ColorBuffersHaveImage()) {
+          return GL_FRAMEBUFFER_COMPLETE;
+        }
+        break;
+      case GL_DRAW_FRAMEBUFFER:
+      case GL_FRAMEBUFFER:
+        if (framebuffer->DrawBuffersHaveNoImage() &&
+            framebuffer->ColorBuffersHaveImage()) {
+          return GL_FRAMEBUFFER_COMPLETE;
+        }
+        break;
+      default:
+        NOTREACHED();
+        break;
+    }
+  }
+
   return framebuffer->GetStatus(texture_manager(), target);
 }