Bug 1097116 - Add fencing and better lifetime management for EGLImage Images r=jgilbert

gfx/layers/opengl/TextureHostOGL.cpp

@@ -68,6 +68,7 @@ CreateTextureHostOGL(const SurfaceDescriptor& aDesc,
       const EGLImageDescriptor& desc = aDesc.get_EGLImageDescriptor();
       result = new EGLImageTextureHost(aFlags,
                                        (EGLImage)desc.image(),
+                                       (EGLSync)desc.fence(),
                                        desc.size());
       break;
     }
@@ -633,9 +634,11 @@ EGLImageTextureSource::GetTextureTransform()
 
 EGLImageTextureHost::EGLImageTextureHost(TextureFlags aFlags,
                                          EGLImage aImage,
+                                         EGLSync aSync,
                                          gfx::IntSize aSize)
   : TextureHost(aFlags)
   , mImage(aImage)
+  , mSync(aSync)
   , mSize(aSize)
   , mCompositor(nullptr)
 {
@@ -658,6 +661,11 @@ EGLImageTextureHost::Lock()
     return false;
   }
 
+  EGLint status = sEGLLibrary.fClientWaitSync(EGL_DISPLAY(), mSync, 0, LOCAL_EGL_FOREVER);
+  if (status != LOCAL_EGL_CONDITION_SATISFIED) {
+    return false;
+  }
+
   if (!mTextureSource) {
     gfx::SurfaceFormat format = gfx::SurfaceFormat::R8G8B8A8;
     GLenum target = LOCAL_GL_TEXTURE_2D;