Register clipboard image blob in the browser process to copy data less.

content/renderer/renderer_clipboard_delegate.cc

Index: content/renderer/renderer_clipboard_delegate.cc
diff --git a/content/renderer/renderer_clipboard_delegate.cc b/content/renderer/renderer_clipboard_delegate.cc
index cd72839ace19a25e901660122b23978c0415267b..b9b7d1c542b6ae3933d1b309580450234ed4188c 100644
--- a/content/renderer/renderer_clipboard_delegate.cc
+++ b/content/renderer/renderer_clipboard_delegate.cc
@@ -69,16 +69,11 @@ void RendererClipboardDelegate::ReadRTF(ui::ClipboardType type,
 }
 
 void RendererClipboardDelegate::ReadImage(ui::ClipboardType type,
-                                          std::string* data) {
-  base::SharedMemoryHandle image_handle;
-  uint32_t image_size = 0;
+                                          std::string* blob_uuid,
+                                          std::string* mime_type,
+                                          int64_t* size) {
   RenderThreadImpl::current()->Send(
-      new ClipboardHostMsg_ReadImage(type, &image_handle, &image_size));
-  if (base::SharedMemory::IsHandleValid(image_handle)) {
-    base::SharedMemory buffer(image_handle, true);
-    buffer.Map(image_size);
-    data->append(static_cast<char*>(buffer.memory()), image_size);
-  }
+      new ClipboardHostMsg_ReadImage(type, blob_uuid, mime_type, size));
 }
 
 void RendererClipboardDelegate::ReadCustomData(ui::ClipboardType clipboard_type,