Introduce printers for Node and Position for ease of developing GTest test files

Introduce printers for Node and Position for ease of developing GTest test files

This patch introduces printers of Node and Position classes to use with GTest
for improving productivity of writing tests using GTest.

This patch is result of collaboration work with hajimehoshi@chromium.org
for selection of web components. After this patch, we are going to
implement another strategies for the composed tree. We've already
prepared that at http://crrev.com/1009603011.

BUG=275851
TEST=n/a; No behavior changes.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=195682

[yosin_UTC9, 2015-04-28 01:42:12]

yosin@chromium.org changed reviewers:
+ tkent@chromium.org

[yosin_UTC9, 2015-04-30 00:55:25]

PTAL

Resolution for build failures:
- Android debug build bot: (unresolved symbol for operator<< of String)
 * Add "wtf_unittest_helpers" to dependencies of "webcore_testing"
 * Android debug build did clobber build
- Oilpan compilation: It seems ostream C++ header isn't included when Oilpan
enabled
 * Add include files as WTFTestHelpers.h

[tkent, 2015-04-30 00:59:33]

https://codereview.chromium.org/1105333002/diff/1/Source/core/core.gyp
File Source/core/core.gyp (right):

https://codereview.chromium.org/1105333002/diff/1/Source/core/core.gyp#newcod...
Source/core/core.gyp:673: 'wtf_unittest_helpers',
Why is it defined conditionally?

You need to update BUILD.gn too.

[yosin_UTC9, 2015-05-20 04:47:50]

Patchset #2 (id:20001) has been deleted

[yosin_UTC9, 2015-05-21 04:28:20]

The CQ bit was checked by yosin@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-05-21 04:28:35]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1105333002/40001

[commit-bot: I haz the power, 2015-05-21 04:31:27]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-05-21 04:31:28]

Dry run: This issue passed the CQ dry run.

[yosin_UTC9, 2015-05-21 05:46:24]

PTAL

- OilPan failures don't relate to this patch.
- android_chromium_gn_compile_dbg should cover GN android build.
 - android_chromium_gn_compile_rel seems to be dead.

https://codereview.chromium.org/1105333002/diff/1/Source/core/core.gyp
File Source/core/core.gyp (right):

https://codereview.chromium.org/1105333002/diff/1/Source/core/core.gyp#newcod...
Source/core/core.gyp:673: 'wtf_unittest_helpers',
On 2015/04/30 00:59:33, Slow until end of May wrote:
> Why is it defined conditionally?
> 
> You need to update BUILD.gn too.

Done.

[tkent, 2015-05-21 05:51:42]

lgtm

https://codereview.chromium.org/1105333002/diff/40001/Source/core/testing/Cor...
File Source/core/testing/CoreTestHelpers.cpp (right):

https://codereview.chromium.org/1105333002/diff/40001/Source/core/testing/Cor...
Source/core/testing/CoreTestHelpers.cpp:13: #include <ios> // NOLINT
is "// NOLINT" necessary?

[yosin_UTC9, 2015-05-21 06:08:33]

Thanks!

Committing...

https://codereview.chromium.org/1105333002/diff/40001/Source/core/testing/Cor...
File Source/core/testing/CoreTestHelpers.cpp (right):

https://codereview.chromium.org/1105333002/diff/40001/Source/core/testing/Cor...
Source/core/testing/CoreTestHelpers.cpp:13: #include <ios> // NOLINT
On 2015/05/21 05:51:42, tkent wrote:
> is "// NOLINT" necessary?

Oh, you're right!
We don't need to have NOLINT for <ios>.

[yosin_UTC9, 2015-05-21 06:08:37]

The CQ bit was checked by yosin@chromium.org

[yosin_UTC9, 2015-05-21 06:08:38]

The patchset sent to the CQ was uploaded after l-g-t-m from tkent@chromium.org
Link to the patchset: https://codereview.chromium.org/1105333002/#ps60001
(title: "2015-05-21T15:05:46")

[commit-bot: I haz the power, 2015-05-21 06:08:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1105333002/60001

[commit-bot: I haz the power, 2015-05-21 08:31:39]

Committed patchset #3 (id:60001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=195682