Mac: Reset active texture state when drawing CAOpenGLLayer

content/common/gpu/image_transport_surface_calayer_mac.mm

 // Copyright 2014 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 "content/common/gpu/image_transport_surface_calayer_mac.h"
 
 #include <OpenGL/CGLRenderers.h>
 
 #include "base/command_line.h"
 #include "base/mac/sdk_forward_declarations.h"
@@ skipping 314 matching lines @@
   glLoadIdentity();
 
   // Reset drawing state and draw a fullscreen quad.
   glUseProgram(0);
   glDisable(GL_BLEND);
   glDisable(GL_CULL_FACE);
   glDisable(GL_DEPTH_TEST);
   glDisable(GL_STENCIL_TEST);
   glDisable(GL_SCISSOR_TEST);
   glColor4f(1, 1, 1, 1);
+  glActiveTexture(GL_TEXTURE0);
   glEnable(GL_TEXTURE_RECTANGLE_ARB);
   glBindTexture(GL_TEXTURE_RECTANGLE_ARB, fbo_texture_);
   glBegin(GL_QUADS);
   {
     glTexCoord2f(0, 0);
     glVertex2f(0, 0);
 
     glTexCoord2f(0, fbo_pixel_size_.height());
     glVertex2f(0, fbo_pixel_size_.height());
 
@@ skipping 39 matching lines @@
     return;
   pending_draw_weak_factory_.InvalidateWeakPtrs();
   has_pending_draw_ = false;
   transport_surface_->SendSwapBuffers(
       ui::SurfaceHandleFromCAContextID([context_ contextId]),
       fbo_pixel_size_,
       fbo_scale_factor_);
 }
 
 }  //  namespace content