Rewrite clipboard write IPC handling to be easier to understand.

ui/base/clipboard/scoped_clipboard_writer.cc

Index: ui/base/clipboard/scoped_clipboard_writer.cc
diff --git a/ui/base/clipboard/scoped_clipboard_writer.cc b/ui/base/clipboard/scoped_clipboard_writer.cc
index 50a7ba39fec8544eec497a55c851387c578a3909..bf1867beeb66e2b90135489fb54b59139b724f2c 100644
--- a/ui/base/clipboard/scoped_clipboard_writer.cc
+++ b/ui/base/clipboard/scoped_clipboard_writer.cc
@@ -86,6 +86,23 @@ void ScopedClipboardWriter::WriteWebSmartPaste() {
   objects_[Clipboard::CBF_WEBKIT] = Clipboard::ObjectMapParams();
 }
 
+void ScopedClipboardWriter::WriteImage(const SkBitmap& bitmap) {
+  if (bitmap.drawsNothing()) {
+    NOTREACHED();
+    return;
+  }
+  bitmap_ = bitmap;
+  // TODO(dcheng): This is slightly less horrible than what we used to do, but
+  // only very slightly less.
+  SkBitmap* bitmap_pointer = &bitmap_;
+  Clipboard::ObjectMapParam packed_pointer;
+  packed_pointer.resize(sizeof(bitmap_pointer));
+  *reinterpret_cast<SkBitmap**>(&*packed_pointer.begin()) = bitmap_pointer;
+  Clipboard::ObjectMapParams parameters;
+  parameters.push_back(packed_pointer);
+  objects_[Clipboard::CBF_SMBITMAP] = parameters;
+}
+
 void ScopedClipboardWriter::WritePickledData(
     const Pickle& pickle, const Clipboard::FormatType& format) {
   std::string format_string = format.Serialize();
@@ -106,6 +123,7 @@ void ScopedClipboardWriter::WritePickledData(
 void ScopedClipboardWriter::Reset() {
   url_text_.clear();
   objects_.clear();
+  bitmap_.reset();
 }
 
 void ScopedClipboardWriter::WriteTextOrURL(const base::string16& text,