[Telemetry] Add IsSvelte

This CL adds IsSvelte to AndroidPlatformBackend, and exposes it through
AndroidPlatform, so that benchmarks can be disabled only on svelte devices.

BUG=555167

Review URL: https://codereview.chromium.org/1455863004

Cr-Commit-Position: refs/heads/master@{#360532}

tools/telemetry/telemetry/core/android_platform.py

@@ -19,6 +19,9 @@ class AndroidPlatform(platform.Platform):
   def android_action_runner(self):
     return self._android_action_runner
 
+  def IsSvelte(self):
+    return self._platform_backend.IsSvelte()
+
   def LaunchAndroidApplication(self, start_intent, is_app_ready_predicate=None,
                                app_has_webviews=True):
     """Launches an Android application given the intent.

tools/telemetry/telemetry/internal/platform/android_platform_backend.py

@@ -214,6 +214,14 @@ class AndroidPlatformBackend(
   def device(self):
     return self._device
 
+  def IsSvelte(self):
+    try:
+      self._device.RunShellCommand(
+          'getprop ro.build.description | grep svelte', check_return=True)
+      return True
+    except device_errors.AdbCommandFailedError:
+      return False
+
   def IsDisplayTracingSupported(self):
     return bool(self.GetOSVersionName() >= 'J')
 

tools/telemetry/telemetry/internal/platform/android_platform_backend_unittest.py

@@ -12,6 +12,7 @@ from telemetry.testing import system_stub
 import mock
 
 from devil.android import battery_utils
+from devil.android import device_errors
 from devil.android import device_utils
 
 class AndroidPlatformBackendTest(unittest.TestCase):
@@ -49,6 +50,22 @@ class AndroidPlatformBackendTest(unittest.TestCase):
     self.setup_prebuilt_tool_patcher.stop()
     self.device_patcher.stop()
 
+  @decorators.Disabled('chromeos')
+  def testIsSvelte(self):
+    with mock.patch('devil.android.device_utils.DeviceUtils.RunShellCommand',
+                    return_value=0):
+      backend = android_platform_backend.AndroidPlatformBackend(
+          android_device.AndroidDevice('12345'), self._options)
+      self.assertTrue(backend.IsSvelte())
+
+  @decorators.Disabled('chromeos')
+  def testIsNotSvelte(self):
+    with mock.patch('devil.android.device_utils.DeviceUtils.RunShellCommand',
+                    side_effect=device_errors.AdbCommandFailedError('m', 'n')):
+      backend = android_platform_backend.AndroidPlatformBackend(
+          android_device.AndroidDevice('12345'), self._options)
+      self.assertFalse(backend.IsSvelte())
+
   @decorators.Disabled('chromeos')
   def testGetCpuStats(self):
     proc_stat_content = (