linux: fix race in TransportDIB passing

linux: fix race in TransportDIB passing

There was a race condition when the renderer passes a TransportDIB to the plugin
process. It is possible that the renderer destroys the TransportDIB before the
plugin handles the message, in which case the plugin will fail to map the shm
handle.

This also cleans up a couple of things.

BUG=18320
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=22949

[Evan Martin, 2009-08-09 05:24:11]

LGTM

http://codereview.chromium.org/164226/diff/1/2
File chrome/common/transport_dib.h (right):

http://codereview.chromium.org/164226/diff/1/2#newcode145
Line 145: DISALLOW_COPY_AND_ASSIGN(TransportDIB);
Maybe extra newline above this?

http://codereview.chromium.org/164226/diff/1/3
File chrome/common/transport_dib_linux.cc (left):

http://codereview.chromium.org/164226/diff/1/3#oldcode48
Line 48: return false;
Ugh, so annoying that this doesn't fail to compile.

[piman, 2009-08-10 20:40:20]

http://codereview.chromium.org/164226/diff/1/2
File chrome/common/transport_dib.h (right):

http://codereview.chromium.org/164226/diff/1/2#newcode145
Line 145: DISALLOW_COPY_AND_ASSIGN(TransportDIB);
On 2009/08/09 05:24:11, Evan Martin wrote:
> Maybe extra newline above this?

Done.