Add a "gn help all" option to GN to print all of the help at once.

Add a "gn help all" option to GN to print all of the help at once.

R=brettw@chromium.org
BUG=468851
Committed: https://crrev.com/a87a30b7582cfe871801bbbfd156f6436e675e33
Cr-Commit-Position: refs/heads/master@{#325567}

[brettw, 2015-04-16 23:35:13]

lgtm

https://codereview.chromium.org/1021923002/diff/1/tools/gn/command_help.cc
File tools/gn/command_help.cc (right):

https://codereview.chromium.org/1021923002/diff/1/tools/gn/command_help.cc#ne...
tools/gn/command_help.cc:83: for (const auto& s : switches::GetSwitches()) {
No {} for these loops

https://codereview.chromium.org/1021923002/diff/1/tools/gn/command_help.cc#ne...
tools/gn/command_help.cc:87: for (const auto& c: commands::GetCommands()) {
Space before the colon for these loops.

https://codereview.chromium.org/1021923002/diff/1/tools/gn/command_help.cc#ne...
tools/gn/command_help.cc:111: 
Got some extra blank lines in here (should just be one)

[Dirk Pranke, 2015-04-16 23:36:50]

https://codereview.chromium.org/1021923002/diff/1/tools/gn/command_help.cc
File tools/gn/command_help.cc (right):

https://codereview.chromium.org/1021923002/diff/1/tools/gn/command_help.cc#ne...
tools/gn/command_help.cc:83: for (const auto& s : switches::GetSwitches()) {
On 2015/04/16 23:35:13, brettw wrote:
> No {} for these loops

ah, right.

https://codereview.chromium.org/1021923002/diff/1/tools/gn/command_help.cc#ne...
tools/gn/command_help.cc:87: for (const auto& c: commands::GetCommands()) {
On 2015/04/16 23:35:13, brettw wrote:
> Space before the colon for these loops.

Acknowledged.

https://codereview.chromium.org/1021923002/diff/1/tools/gn/command_help.cc#ne...
tools/gn/command_help.cc:111: 
On 2015/04/16 23:35:13, brettw wrote:
> Got some extra blank lines in here (should just be one)

Acknowledged.

[Dirk Pranke, 2015-04-16 23:39:31]

The CQ bit was checked by dpranke@chromium.org

[Dirk Pranke, 2015-04-16 23:39:31]

The patchset sent to the CQ was uploaded after l-g-t-m from brettw@chromium.org
Link to the patchset: https://codereview.chromium.org/1021923002/#ps20001
(title: "review feedback - remove braces and blank lines")

[commit-bot: I haz the power, 2015-04-16 23:41:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1021923002/20001

[commit-bot: I haz the power, 2015-04-17 00:31:31]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-04-17 00:32:26]

Patchset 2 (id:??) landed as
https://crrev.com/a87a30b7582cfe871801bbbfd156f6436e675e33
Cr-Commit-Position: refs/heads/master@{#325567}