Allow OpenApkAsset() to open resource files as well as assets.

Allow OpenApkAsset() to open resource files as well as assets.

This will be necessary for when language .pak files are moved to
res/raw (for apk splits).

BUG=394502
Committed: https://crrev.com/62536bc6e789895ea8dbd814b43c49b4479ba4db
Cr-Commit-Position: refs/heads/master@{#332998}

[agrieve, 2015-06-03 01:16:31]

agrieve@chromium.org changed reviewers:
+ nyquist@chromium.org, torne@chromium.org

[agrieve, 2015-06-03 01:16:32]

Thought about having two functions: 
  * OpenApkAsset("icudtl.dat")
  * OpenApkResource("raw/file.pak")

but I think having one function that can handle all paths is more flexible and
easier to reason about in the end (just give it the path that the file actually
exists at)

[Torne, 2015-06-03 09:43:56]

lgtm

[agrieve, 2015-06-03 14:02:59]

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

[commit-bot: I haz the power, 2015-06-03 14:04:01]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1156573008/1

[agrieve, 2015-06-03 14:57:47]

agrieve@chromium.org changed reviewers:
+ rmcilroy@chromium.org

[commit-bot: I haz the power, 2015-06-03 16:57:14]

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

[commit-bot: I haz the power, 2015-06-03 16:57:16]

Dry run: This issue passed the CQ dry run.

[agrieve, 2015-06-04 19:09:42]

On 2015/06/03 16:57:16, commit-bot: I haz the power wrote:
> Dry run: This issue passed the CQ dry run.

bump

[nyquist, 2015-06-04 20:25:22]

base lgtm

[agrieve, 2015-06-05 01:58:16]

The CQ bit was checked by agrieve@chromium.org

[commit-bot: I haz the power, 2015-06-05 01:59:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1156573008/1

[commit-bot: I haz the power, 2015-06-05 03:01:42]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-05 03:02:23]

Patchset 1 (id:??) landed as
https://crrev.com/62536bc6e789895ea8dbd814b43c49b4479ba4db
Cr-Commit-Position: refs/heads/master@{#332998}