Tweak libpng encoding parameters to increase speed on very large images.

content/browser/renderer_host/clipboard_message_filter.cc

Index: content/browser/renderer_host/clipboard_message_filter.cc
diff --git a/content/browser/renderer_host/clipboard_message_filter.cc b/content/browser/renderer_host/clipboard_message_filter.cc
index e317c9e81beccc0dcd4131765ce5eef17ab5ce64..8682410f857fe8ee003cb251858ae884119e5376 100644
--- a/content/browser/renderer_host/clipboard_message_filter.cc
+++ b/content/browser/renderer_host/clipboard_message_filter.cc
@@ -192,7 +192,8 @@ void ClipboardMessageFilter::ReadAndEncodeImage(const SkBitmap& bitmap,
                                                 IPC::Message* reply_msg) {
   if (!bitmap.isNull()) {
     std::unique_ptr<std::vector<uint8_t>> png_data(new std::vector<uint8_t>);
-    if (gfx::PNGCodec::FastEncodeBGRASkBitmap(bitmap, false, png_data.get())) {
+    if (gfx::PNGCodec::NoCompressEncodeBGRASkBitmap(bitmap, false,
+                                                    png_data.get())) {
       BrowserThread::PostTask(
           BrowserThread::IO, FROM_HERE,
           base::Bind(&ClipboardMessageFilter::OnReadAndEncodeImageFinished,