Revert of Remove blink::WebLayerClient and WebGraphicsLayerDebugInfo.

third_party/WebKit/public/platform/WebLayerClient.h

Index: third_party/WebKit/public/platform/WebLayerClient.h
diff --git a/third_party/WebKit/public/platform/WebLayerClient.h b/third_party/WebKit/public/platform/WebLayerClient.h
new file mode 100644
index 0000000000000000000000000000000000000000..74cd3f0aae8ff2645b1aff40523c629237a46b73
--- /dev/null
+++ b/third_party/WebKit/public/platform/WebLayerClient.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2013 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef WebLayerClient_h
+#define WebLayerClient_h
+
+#include "WebCommon.h"
+
+namespace blink {
+
+class WebGraphicsLayerDebugInfo;
+
+class BLINK_PLATFORM_EXPORT WebLayerClient {
+public:
+    // Returns a pointer to a debug info object, if one has been computed.
+    // If not, returns 0. If the returned pointer is non-zero, the caller takes
+    // ownership of the pointer. The parameter allows us to return WebLayer-
+    // specific information, too (only the debug name for now).
+    virtual WebGraphicsLayerDebugInfo* takeDebugInfoFor(WebLayer*) = 0;
+
+protected:
+    virtual ~WebLayerClient() { }
+};
+
+} // namespace blink
+
+#endif // WebLayerClient_h
+