On both mac and linux, I ran:
git checkout v1.0.0
ninja
./ninja ninja_test
./ninja_test  # all passed
strip ninja

Changes since the last push:
* NINJA_STATUS can now print rates via the o and c format chars
* The version switch is now --version, -V no longer works
* -t list now works without a build.ninja
* Old .ninja_log files now trigger a rebuild instead of an error
* Missing .d files make the corresponding .o file dirty
* Allow @ and = in paths in depfiles
* Ninja's output is now lower-case ("error:" instead of "ERROR:" etc)
* Lots of Windows features (which doesn't affect Mac and Linux)

On Linux, I switched from gcc4.4.3 to clang r163126. The clang-built
binary is 125856 bytes (compared to 129944 bytes previously), and it does
an empty 'chrome' build about 70ms faster (0.94s instead of 1.01s).

The speed difference is almost completely in faster depfile parsing:

clang-built (0.943s):
$ time ../../ninja/ninja -C out/Release chrome -d stats
ninja: Entering directory `out/Release'
ninja: no work to do.
metric                  count   avg (us)        total (ms)
.ninja parse            716     507.8           363.6
canonicalize str        113486  0.2             27.7
canonicalize path       1305641 0.1             184.1
lookup node             1305641 0.2             200.9
.ninja_log load         1       11144.0         11.1
node stat               37828   2.6             98.0
depfile load            9266    80.9            749.3

path->node hash load 0.98 (48241 entries / 49157 buckets)

real    0m1.162s
user    0m0.980s
sys     0m0.170s


gcc-built (1.013s):
$ time ninja -C out/Release chrome -d stats
ninja: Entering directory `out/Release'
ninja: no work to do.
metric                  count   avg (us)        total (ms)
.ninja parse            716     516.4           369.7
canonicalize str        113486  0.2             27.6
canonicalize path       1305641 0.1             181.0
lookup node             1305641 0.2             260.0
.ninja_log load         1       11012.0         11.0
node stat               37828   2.6             98.2
depfile load            9266    86.3            799.3

path->node hash load 0.98 (48241 entries / 49157 buckets)

real    0m1.220s
user    0m0.970s
sys     0m0.240s



On Mac, I alsow used clang r163126. The binary size stayed at 125104 bytes,
performance didn't change. An empty build of chrome takes 1.26s. While
node stat is a bit slower, and there are more defiles to parse compared
to linux, most of the time difference is in slower .ninja parsing:

mac (1.263s):
$ time ../../ninja/ninja -C out/Release/ chrome -d stats
ninja: Entering directory `out/Release/'
ninja: no work to do.
metric                  count   avg (us)        total (ms)
.ninja parse            687     823.4           565.7
canonicalize str        115002  0.3             31.1
canonicalize path       1120853 0.2             175.6
lookup node             1120853 0.2             202.9
.ninja_log load         1       54126.0         54.1
node stat               38860   4.1             160.4
depfile load            9649    86.1            830.8

path->node hash load 0.99 (48522 entries / 49157 buckets)

real    0m1.478s
user    0m1.121s
sys     0m0.351s

TBR=scottmg
Review URL: https://codereview.chromium.org/10918242

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@156751 0039d316-1c4b-4281-b951-d872f2087c98