Reland cmaa, gpu: use R8 image texture when GL_NV_image_formats is available.

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 125ef5347ecd204df76b357542e7e86fdad79122..6fb3faedb45e9143ac7acb69278d480f448bd20b 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -17603,7 +17603,6 @@ void GLES2DecoderImpl::DoApplyScreenSpaceAntialiasingCHROMIUM() {
       apply_framebuffer_attachment_cmaa_intel_.reset(
           new ApplyFramebufferAttachmentCMAAINTELResourceManager());
       apply_framebuffer_attachment_cmaa_intel_->Initialize(this);
-      RestoreCurrentFramebufferBindings();
       if (LOCAL_PEEK_GL_ERROR("glApplyFramebufferAttachmentCMAAINTEL") !=
           GL_NO_ERROR)
         return;