gpu: Mailbox emulation with EGLImage

gpu/command_buffer/service/texture_manager.cc

Index: gpu/command_buffer/service/texture_manager.cc
diff --git a/gpu/command_buffer/service/texture_manager.cc b/gpu/command_buffer/service/texture_manager.cc
index 38516e7d49a7887c5685917a36fb585463ad9d1b..ed0add1a9569540ce7c6cdbf20763d375af5e85c 100644
--- a/gpu/command_buffer/service/texture_manager.cc
+++ b/gpu/command_buffer/service/texture_manager.cc
@@ -817,6 +817,21 @@ gfx::GLImage* Texture::GetLevelImage(GLint target, GLint level) const {
   return 0;
 }
 
+void Texture::OnWillModifyPixels() {
+  if (target()) {
+    gfx::GLImage* image = GetLevelImage(target(), 0);
+    if (image)
+      image->WillModifyPixels();
+  }
+}
+
+void Texture::OnDidModifyPixels() {
+  if (target()) {
+    gfx::GLImage* image = GetLevelImage(target(), 0);
+    if (image)
+      image->DidModifyPixels();
+  }
+}
 
 TextureRef::TextureRef(TextureManager* manager,
                        GLuint client_id,