Fix bunch of web test failures on Android and Fuchsia

On Android and Fuchsia, all of web tests are accessed via http, and
'LayoutTests' was prepended to their URLs even after the Great Blink mv.
It should be updated to 'web_tests' because some tests find test root
directory by searching for 'web_tests', and test_runner changes its
behavior by checking path names in a URL [1].

[1] https://cs.chromium.org/chromium/src/content/shell/test_runner/test_interfaces.cc?type=cs&sq=package:chromium&g=0&l=35

TBR=qyesrsley@chromium.org

No-Try: true
Bug: 909012
Change-Id: Ia4a45238d55248d2fc6c06b56c3878aa0a38d8a3
Reviewed-on: https://chromium-review.googlesource.com/c/1352118Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611454}

third_party/blink/tools/blinkpy/web_tests/port/android.py

@@ -37,6 +37,7 @@ import time
 
 from blinkpy.common import exit_codes
 from blinkpy.common.path_finder import RELATIVE_WEB_TESTS
+from blinkpy.common.path_finder import WEB_TESTS_LAST_COMPONENT
 from blinkpy.common.path_finder import get_chromium_src_dir
 from blinkpy.common.system.executive import ScriptError
 from blinkpy.common.system.profiler import SingleFileOutputProfiler
@@ -112,8 +113,11 @@ KPTR_RESTRICT_PATH = '/proc/sys/kernel/kptr_restrict'
 # but we use a file-to-http feature to bridge the file request to host's http
 # server to get the real test files and corresponding resources.
 # See webkit/support/platform_support_android.cc for the other side of this bridge.
+# WEB_TEST_PATH_PREFIX should be matched to the local directory name of
+# web_tests because some tests and test_runner find test root directory
+# with it.
 PERF_TEST_PATH_PREFIX = '/PerformanceTests'
-LAYOUT_TEST_PATH_PREFIX = '/LayoutTests'
+WEB_TESTS_PATH_PREFIX = '/' + WEB_TESTS_LAST_COMPONENT
 
 # We start netcat processes for each of the three stdio streams. In doing so,
 # we attempt to use ports starting from 10201. This starting value is
@@ -469,7 +473,7 @@ class AndroidPort(base.Port):
 
     def start_http_server(self, additional_dirs, number_of_drivers):
         additional_dirs[PERF_TEST_PATH_PREFIX] = self._perf_tests_dir()
-        additional_dirs[LAYOUT_TEST_PATH_PREFIX] = self.layout_tests_dir()
+        additional_dirs[WEB_TESTS_PATH_PREFIX] = self.layout_tests_dir()
         super(AndroidPort, self).start_http_server(additional_dirs, number_of_drivers)
 
     def create_driver(self, worker_number, no_timeout=False):

third_party/blink/tools/blinkpy/web_tests/port/fuchsia.py

@@ -35,6 +35,7 @@ import sys
 import threading
 
 from blinkpy.common import exit_codes
+from blinkpy.common.path_finder import WEB_TESTS_LAST_COMPONENT
 from blinkpy.common.path_finder import get_chromium_src_dir
 from blinkpy.web_tests.port import base
 from blinkpy.web_tests.port import driver
@@ -70,9 +71,12 @@ def _import_fuchsia_runner():
 # Path to the content shell package relative to the build directory.
 CONTENT_SHELL_PACKAGE_PATH = 'gen/content/shell/content_shell/content_shell.far'
 
-# HTTP path prefix for the HTTP server.
+# HTTP path prefixes for the HTTP server.
+# WEB_TEST_PATH_PREFIX should be matched to the local directory name of
+# web_tests because some tests and test_runner find test root directory
+# with it.
 PERF_TEST_PATH_PREFIX = '/PerformanceTests'
-LAYOUT_TEST_PATH_PREFIX = '/LayoutTests'
+WEB_TESTS_PATH_PREFIX = '/' + WEB_TESTS_LAST_COMPONENT
 
 # Paths to the directory where the fonts are copied to. Must match the path in
 # content/shell/app/blink_test_platform_support_fuchsia.cc .
@@ -245,7 +249,7 @@ class FuchsiaPort(base.Port):
 
     def start_http_server(self, additional_dirs, number_of_drivers):
         additional_dirs[PERF_TEST_PATH_PREFIX] = self._perf_tests_dir()
-        additional_dirs[LAYOUT_TEST_PATH_PREFIX] = self.layout_tests_dir()
+        additional_dirs[WEB_TESTS_PATH_PREFIX] = self.layout_tests_dir()
         super(FuchsiaPort, self).start_http_server(
             additional_dirs, number_of_drivers)
 

third_party/blink/web_tests/platform/android/fast/events/simulated-click-on-anchor-with-target-blank-expected.txt

-Default policy for navigation to 'http://127.0.0.1:8000/LayoutTests/fast/events/blank' is 'new background tab'
+Default policy for navigation to 'http://127.0.0.1:8000/web_tests/fast/events/blank' is 'new background tab'
 Tests that hitting ctrl-enter on a link with target=_blank still opens it in the background
 
 link

third_party/blink/web_tests/platform/fuchsia/fast/events/simulated-click-on-anchor-with-target-blank-expected.txt

-Default policy for navigation to 'http://127.0.0.1:8000/LayoutTests/fast/events/blank' is 'new background tab'
+Default policy for navigation to 'http://127.0.0.1:8000/web_tests/fast/events/blank' is 'new background tab'
 Tests that hitting ctrl-enter on a link with target=_blank still opens it in the background
 
 link