Bind framebuffer to fbo_ object before readPixels, rather than multisample_fbo_

third_party/WebKit/Source/platform/graphics/gpu/DrawingBufferTestHelpers.h

 // Copyright 2016 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 "gpu/command_buffer/common/capabilities.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/graphics/CanvasColorParams.h"
 #include "platform/graphics/gpu/DrawingBuffer.h"
 #include "platform/graphics/gpu/Extensions3DUtil.h"
 #include "public/platform/WebGraphicsContext3DProvider.h"
@@ skipping 196 matching lines @@
   void WaitSyncTokenCHROMIUM(const GLbyte* sync_token) override {
     memcpy(&most_recently_waited_sync_token_, sync_token,
            sizeof(most_recently_waited_sync_token_));
   }
 
   GLenum CheckFramebufferStatus(GLenum target) override {
     return GL_FRAMEBUFFER_COMPLETE;
   }
 
   void GetIntegerv(GLenum pname, GLint* value) override {
-    if (pname == GL_MAX_TEXTURE_SIZE)
-      *value = 1024;
+    switch (pname) {
+      case GL_DRAW_FRAMEBUFFER_BINDING:
+        *value = state_.draw_framebuffer_binding;
+        break;
+      case GL_READ_FRAMEBUFFER_BINDING:
+        *value = state_.read_framebuffer_binding;
+        break;
+      case GL_MAX_TEXTURE_SIZE:
+        *value = 1024;
+      default:
+        break;
+    }
   }
 
   void GenMailboxCHROMIUM(GLbyte* mailbox) override {
     ++current_mailbox_byte_;
     memset(mailbox, current_mailbox_byte_, GL_MAILBOX_SIZE_CHROMIUM);
   }
 
   void ProduceTextureDirectCHROMIUM(GLuint texture,
                                     GLenum target,
                                     const GLbyte* mailbox) override {
@@ skipping 173 matching lines @@
   GLbyte current_mailbox_byte_ = 0;
   IntSize most_recently_produced_size_;
   bool create_image_chromium_fail_ = false;
   GLuint current_image_id_ = 1;
   HashMap<GLuint, IntSize> texture_sizes_;
   HashMap<GLuint, IntSize> image_sizes_;
   HashMap<GLuint, GLuint> image_to_texture_map_;
 };
 
 }  // blink