Unbind video texture from mailbox after copying to WebGL.

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 dc009c82bfd34e95ce3297b6a083858d5db9cb86..490033208bdcf0a42bb1150dc065790efadd99f1 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -1070,6 +1070,7 @@ class GLES2DecoderImpl : public GLES2Decoder, public ErrorStateClient {
   void DoProduceTextureDirectCHROMIUM(GLuint texture, GLenum target,
       const GLbyte* key);
   void ProduceTextureRef(const char* func_name,
+                         bool clear,
                          TextureRef* texture_ref,
                          GLenum target,
                          const GLbyte* data);
@@ -15812,7 +15813,8 @@ void GLES2DecoderImpl::DoProduceTextureCHROMIUM(GLenum target,
 
   TextureRef* texture_ref = texture_manager()->GetTextureInfoForTarget(
       &state_, target);
-  ProduceTextureRef("glProduceTextureCHROMIUM", texture_ref, target, data);
+  ProduceTextureRef("glProduceTextureCHROMIUM", false, texture_ref, target,
+                    data);
 }
 
 void GLES2DecoderImpl::DoProduceTextureDirectCHROMIUM(GLuint client_id,
@@ -15821,11 +15823,12 @@ void GLES2DecoderImpl::DoProduceTextureDirectCHROMIUM(GLuint client_id,
       "context", logger_.GetLogPrefix(),
       "mailbox[0]", static_cast<unsigned char>(data[0]));
 
-  ProduceTextureRef("glProduceTextureDirectCHROMIUM", GetTexture(client_id),
-      target, data);
+  ProduceTextureRef("glProduceTextureDirectCHROMIUM", !client_id,
+                    GetTexture(client_id), target, data);
 }
 
 void GLES2DecoderImpl::ProduceTextureRef(const char* func_name,
+                                         bool clear,
                                          TextureRef* texture_ref,
                                          GLenum target,
                                          const GLbyte* data) {
@@ -15834,6 +15837,13 @@ void GLES2DecoderImpl::ProduceTextureRef(const char* func_name,
                                        "mailbox that was not generated by "
                                        "GenMailboxCHROMIUM.";
 
+  if (clear) {
+    DCHECK(!texture_ref);
+
+    group_->mailbox_manager()->ProduceTexture(mailbox, nullptr);
+    return;
+  }
+
   if (!texture_ref) {
     LOCAL_SET_GL_ERROR(
         GL_INVALID_OPERATION, func_name, "unknown texture for target");