Bug 1558598 - Force WebRender on or off in the cppunit harness. r=ahal

Also adds it to the mach command, which is a little weird, because the
mach command doesn't expose the option but does parse it via the cpp unit
argument parser. So I just exposed it on the mach command and after that
it Just Works for mach.

Differential Revision: https://phabricator.services.mozilla.com/D35859

--HG--
extra : moz-landing-system : lando

testing/mach_commands.py

@@ -374,6 +374,9 @@ class Test(MachCommandBase):
 class MachCommands(MachCommandBase):
     @Command('cppunittest', category='testing',
              description='Run cpp unit tests (C++ tests).')
+    @CommandArgument('--enable-webrender', action='store_true', default=False,
+                     dest='enable_webrender',
+                     help='Enable the WebRender compositor in Gecko.')
     @CommandArgument('test_files', nargs='*', metavar='N',
                      help='Test to run. Can be specified as one or more files or '
                      'directories, or omitted. If omitted, the entire test suite is '

testing/remotecppunittests.py

@@ -97,8 +97,8 @@ class RemoteCPPUnitTests(cppunittests.CPPUnitTests):
                 self.remote_bin_dir, os.path.basename(local_file))
             self.device.push(local_file, remote_file)
 
-    def build_environment(self):
-        env = self.build_core_environment()
+    def build_environment(self, enable_webrender=False):
+        env = self.build_core_environment({}, enable_webrender)
         env['LD_LIBRARY_PATH'] = self.remote_bin_dir
         env["TMPDIR"] = self.remote_tmp_dir
         env["HOME"] = self.remote_home_dir
@@ -230,7 +230,8 @@ def run_test_harness(options, args):
                                                      mozinfo.info,
                                                      options.manifest_path)
     tester = RemoteCPPUnitTests(options, [item[0] for item in progs])
-    result = tester.run_tests(progs, options.xre_path, options.symbols_path)
+    result = tester.run_tests(progs, options.xre_path, options.symbols_path,
+                              enable_webrender=options.enable_webrender)
     return result
 
 

testing/runcppunittests.py

@@ -90,7 +90,7 @@ class CPPUnitTests(object):
                 self.log.test_end(basename, status='PASS', expected='PASS')
             return result
 
-    def build_core_environment(self, env={}):
+    def build_core_environment(self, env, enable_webrender):
         """
         Add environment variables likely to be used across all platforms, including remote systems.
         """
@@ -100,9 +100,16 @@ class CPPUnitTests(object):
         env["XPCOM_DEBUG_BREAK"] = "stack-and-abort"
         env["MOZ_CRASHREPORTER_NO_REPORT"] = "1"
         env["MOZ_CRASHREPORTER"] = "1"
+
+        if enable_webrender:
+            env['MOZ_WEBRENDER'] = '1'
+            env['MOZ_ACCELERATED'] = '1'
+        else:
+            env['MOZ_WEBRENDER'] = '0'
+
         return env
 
-    def build_environment(self):
+    def build_environment(self, enable_webrender=False):
         """
         Create and return a dictionary of all the appropriate env variables and values.
         On a remote system, we overload this to set different values and are missing things
@@ -111,7 +118,7 @@ class CPPUnitTests(object):
         if not os.path.isdir(self.xre_path):
             raise Exception("xre_path does not exist: %s", self.xre_path)
         env = dict(os.environ)
-        env = self.build_core_environment(env)
+        env = self.build_core_environment(env, enable_webrender)
         pathvar = ""
         libpath = self.xre_path
         if mozinfo.os == "linux":
@@ -150,7 +157,7 @@ class CPPUnitTests(object):
         return env
 
     def run_tests(self, programs, xre_path, symbols_path=None,
-                  utility_path=None, interactive=False):
+                  utility_path=None, enable_webrender=False, interactive=False):
         """
         Run a set of C++ unit test programs.
 
@@ -171,7 +178,7 @@ class CPPUnitTests(object):
             self.fix_stack = mozrunner.utils.get_stack_fixer_function(
                 utility_path, symbols_path)
         self.log.suite_start(programs, name='cppunittest')
-        env = self.build_environment()
+        env = self.build_environment(enable_webrender)
         pass_count = 0
         fail_count = 0
         for prog in programs:
@@ -212,6 +219,10 @@ class CPPUnittestOptions(OptionParser):
                         action="store", type="string", dest="utility_path",
                         default=None,
                         help="path to directory containing utility programs")
+        self.add_option("--enable-webrender",
+                        action="store_true", dest="enable_webrender",
+                        default=False,
+                        help="Enable the WebRender compositor in Gecko")
 
 
 def extract_unittests_from_args(args, environ, manifest_path):
@@ -276,7 +287,7 @@ def run_test_harness(options, args):
     options.utility_path = os.path.abspath(options.utility_path)
     tester = CPPUnitTests()
     result = tester.run_tests(progs, options.xre_path, options.symbols_path,
-                              options.utility_path)
+                              options.utility_path, options.enable_webrender)
 
     return result