Include angle_unittests as part of gpu builder targets.

So we can add the test step to gpu bots.

BUG=
TEST=build fine on all bots
R=kbr@chromium.org

Review URL: https://codereview.chromium.org/76923002

git-svn-id: http://src.chromium.org/svn/trunk/src/build@236182 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

all.gyp

@@ -458,6 +458,7 @@
             '../content/content_shell_and_tests.gyp:content_browsertests',
             '../content/content_shell_and_tests.gyp:content_gl_tests',
             '../gpu/gpu.gyp:gl_tests',
+            '../gpu/gpu.gyp:angle_unittests',
           ],
           'conditions': [
             ['internal_gles2_conform_tests', {
@@ -495,6 +496,7 @@
             '../content/content_shell_and_tests.gyp:content_browsertests',
             '../content/content_shell_and_tests.gyp:content_gl_tests',
             '../gpu/gpu.gyp:gl_tests',
+            '../gpu/gpu.gyp:angle_unittests',
           ],
           'conditions': [
             ['internal_gles2_conform_tests', {