Prevent duplicate navigation to debug URLs from Telemetry.

content/test/gpu/gpu_tests/context_lost.py

Index: content/test/gpu/gpu_tests/context_lost.py
diff --git a/content/test/gpu/gpu_tests/context_lost.py b/content/test/gpu/gpu_tests/context_lost.py
index 731fffbfd4c7485f106b472f0dd4427a673db6b9..e3752a8a2b22bac58ab7c7578fb9bd5d4c1fe186 100644
--- a/content/test/gpu/gpu_tests/context_lost.py
+++ b/content/test/gpu/gpu_tests/context_lost.py
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 import os
+import time
 
 from telemetry import benchmark as benchmark_module
 from telemetry.core import exceptions
@@ -37,6 +38,11 @@ harness_script = r"""
     }
   }
 
+  domAutomationController.reset = function() {
+    domAutomationController._succeeded = false;
+    domAutomationController._finished = false;
+  }
+
   window.domAutomationController = domAutomationController;
   console.log("Harness injected.");
 """
@@ -65,18 +71,19 @@ class _ContextLostValidator(page_test.PageTest):
       for x in range(page.number_of_gpu_process_kills):
         if not tab.browser.supports_tab_control:
           raise page_test.Failure('Browser must support tab control')
+
+        expected_kills = x + 1
+
         # Reset the test's state.
         tab.EvaluateJavaScript(
-          'window.domAutomationController._succeeded = false');
-        tab.EvaluateJavaScript(
-          'window.domAutomationController._finished = false');
+          'window.domAutomationController.reset()');
         # Crash the GPU process.
-        new_tab = tab.browser.tabs.New()
+        gpucrash_tab = tab.browser.tabs.New()
         # To access these debug URLs from Telemetry, they have to be
         # written using the chrome:// scheme.
         # The try/except is a workaround for crbug.com/368107.
         try:
-          new_tab.Navigate('chrome://gpucrash')
+          gpucrash_tab.Navigate('chrome://gpucrash')
         except (exceptions.TabCrashException, Exception):
           print 'Tab crashed while navigating to chrome://gpucrash'
         # Activate the original tab and wait for completion.
@@ -88,9 +95,33 @@ class _ContextLostValidator(page_test.PageTest):
           completed = True
         except util.TimeoutException:
           pass
+
+        if page.check_crash_count:
+          if not tab.browser.supports_system_info:
+            raise page_test.Failure('Browser must support system info')
+
+          number_of_crashes = -1
+          # To allow time for a gpucrash to complete, wait 10s with
+          # maximum retry x3 times.
+          for retry in range(3):
+            time.sleep(10)
+            system_info = tab.browser.GetSystemInfo()
+            number_of_crashes = \
+                system_info.gpu.aux_attributes[u'process_crash_count']
+            if number_of_crashes >= expected_kills:
+              break
+
+          if number_of_crashes < expected_kills:
+            raise page_test.Failure(
+                'Timed out waiting for a gpu process crash')
+          elif number_of_crashes != expected_kills:
+            raise page_test.Failure(
+                'Expected %d gpu process crashes; got: %d' %
+                (expected_kills, number_of_crashes))
+
         # The try/except is a workaround for crbug.com/368107.
         try:
-          new_tab.Close()
+          gpucrash_tab.Close()
         except (exceptions.TabCrashException, Exception):
           print 'Tab crashed while closing chrome://gpucrash'
         if not completed:
@@ -137,6 +168,26 @@ class _ContextLostValidator(page_test.PageTest):
         'window.domAutomationController._succeeded'):
         raise page_test.Failure('Test failed')
 
+# Test that navigating to chrome://gpucrash causes the GPU process to crash
+# exactly one time per navigation.
+class GPUProcessCrashesExactlyOnce(page.Page):
+  def __init__(self, page_set, base_dir):
+    super(GPUProcessCrashesExactlyOnce, self).__init__(
+      url='file://gpu_process_crash.html',
+      page_set=page_set,
+      base_dir=base_dir,
+      name='GpuCrash.GPUProcessCrashesExactlyOnce')
+    self.script_to_evaluate_on_commit = harness_script
+    self.kill_gpu_process = True
+    self.number_of_gpu_process_kills = 2
+    self.check_crash_count = True
+    self.force_garbage_collection = False
+
+  def RunNavigateSteps(self, action_runner):
+    action_runner.NavigateToPage(self)
+    action_runner.WaitForJavaScriptCondition(
+        'window.domAutomationController._loaded')
+
 class WebGLContextLostFromGPUProcessExitPage(page.Page):
   def __init__(self, page_set, base_dir):
     super(WebGLContextLostFromGPUProcessExitPage, self).__init__(
@@ -146,6 +197,7 @@ class WebGLContextLostFromGPUProcessExitPage(page.Page):
       name='ContextLost.WebGLContextLostFromGPUProcessExit')
     self.script_to_evaluate_on_commit = harness_script
     self.kill_gpu_process = True
+    self.check_crash_count = False
     self.number_of_gpu_process_kills = 1
     self.force_garbage_collection = False
 
@@ -164,6 +216,7 @@ class WebGLContextLostFromLoseContextExtensionPage(page.Page):
       name='ContextLost.WebGLContextLostFromLoseContextExtension')
     self.script_to_evaluate_on_commit = harness_script
     self.kill_gpu_process = False
+    self.check_crash_count = False
     self.force_garbage_collection = False
 
   def RunNavigateSteps(self, action_runner):
@@ -180,6 +233,7 @@ class WebGLContextLostFromQuantityPage(page.Page):
       name='ContextLost.WebGLContextLostFromQuantity')
     self.script_to_evaluate_on_commit = harness_script
     self.kill_gpu_process = False
+    self.check_crash_count = False
     self.force_garbage_collection = True
 
   def RunNavigateSteps(self, action_runner):
@@ -196,6 +250,7 @@ class WebGLContextLostFromSelectElementPage(page.Page):
       name='ContextLost.WebGLContextLostFromSelectElement')
     self.script_to_evaluate_on_commit = harness_script
     self.kill_gpu_process = False
+    self.check_crash_count = False
     self.force_garbage_collection = False
 
   def RunNavigateSteps(self, action_runner):
@@ -214,6 +269,7 @@ class ContextLost(benchmark_module.Benchmark):
       file_path=data_path,
       user_agent_type='desktop',
       serving_dirs=set(['']))
+    ps.AddPage(GPUProcessCrashesExactlyOnce(ps, ps.base_dir))
     ps.AddPage(WebGLContextLostFromGPUProcessExitPage(ps, ps.base_dir))
     ps.AddPage(WebGLContextLostFromLoseContextExtensionPage(ps, ps.base_dir))
     ps.AddPage(WebGLContextLostFromQuantityPage(ps, ps.base_dir))