Re-write _BufferList to keep an internal Uint8List buffer, that will grow on demand.

Re-write _BufferList to keep an internal Uint8List buffer, that will grow on demand.

This eliminates a lot of the performance issues seen with _BufferList.
We now do either setRange if it's Uint8List, or a fast iteration for any
other list (in case of e.g. CodeUnits).

BUG=

Committed: https://code.google.com/p/dart/source/detail?r=21679

[Søren Gjesse, 2013-04-18 13:19:11]

lgtm

https://codereview.chromium.org/14057010/diff/1/sdk/lib/io/buffer_list.dart
File sdk/lib/io/buffer_list.dart (right):

https://codereview.chromium.org/14057010/diff/1/sdk/lib/io/buffer_list.dart#n...
sdk/lib/io/buffer_list.dart:39: // This will give is a liste in the range of 2-4
times larger than
liste -> list

https://codereview.chromium.org/14057010/diff/1/sdk/lib/io/buffer_list.dart#n...
sdk/lib/io/buffer_list.dart:60: void write(List<int> buffer) {
Why do we have write?

[Anders Johnsen, 2013-04-18 16:22:07]

https://codereview.chromium.org/14057010/diff/1/sdk/lib/io/buffer_list.dart
File sdk/lib/io/buffer_list.dart (right):

https://codereview.chromium.org/14057010/diff/1/sdk/lib/io/buffer_list.dart#n...
sdk/lib/io/buffer_list.dart:39: // This will give is a liste in the range of 2-4
times larger than
On 2013/04/18 13:19:11, Søren Gjesse wrote:
> liste -> list

Done.

https://codereview.chromium.org/14057010/diff/1/sdk/lib/io/buffer_list.dart#n...
sdk/lib/io/buffer_list.dart:60: void write(List<int> buffer) {
On 2013/04/18 13:19:11, Søren Gjesse wrote:
> Why do we have write?

So it can be called just like a StringBuffer. (used in websocket impl)

[Anders Johnsen, 2013-04-18 16:22:25]

Committed patchset #2 manually as r21679 (presubmit successful).