sandwich: Move all NoState-Prefetch related code in sandwich_prefetch.py

tools/android/loading/sandwich_utils.py

Index: tools/android/loading/sandwich_utils.py
diff --git a/tools/android/loading/sandwich_utils.py b/tools/android/loading/sandwich_utils.py
new file mode 100644
index 0000000000000000000000000000000000000000..3942eecb20068a00a0d3899993a8409e4e49592b
--- /dev/null
+++ b/tools/android/loading/sandwich_utils.py
@@ -0,0 +1,76 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import common_util
+import emulation
+import sandwich_runner
+import task_manager
+
+
+def NetworkSimulationTransformer(network_condition):
+  """Creates a function that accepts a SandwichRunner as a parameter and sets
+  network emulation options on it.
+
+  Args:
+    network_condition: The network condition to apply to the sandwich runner.
+
+  Returns:
+    A callback transforming the SandwichRunner given in argument accordingly
+  """
+  assert network_condition in emulation.NETWORK_CONDITIONS
+  def Transformer(runner):
+    assert isinstance(runner, sandwich_runner.SandwichRunner)
+    runner.network_condition = network_condition
+  return Transformer
+
+
+class SandwichCommonBuilder(task_manager.Builder):
+  """A builder for a graph of tasks, each prepares or invokes a SandwichRunner.
+  """
+
+  def __init__(self, android_device, url, output_directory,
+               output_subdirectory):
+    """Constructor.
+
+    Args:
+      android_device: The android DeviceUtils to run sandwich on or None to run
+        it locally.
+      url: URL to benchmark.
+      output_directory: As in task_manager.Builder.__init__
+      output_subdirectory: As in task_manager.Builder.__init__
+    """
+    task_manager.Builder.__init__(self, output_directory, output_subdirectory)
+    self._android_device = android_device
+    self._url = url
+    self.default_final_tasks = []
+
+    self.original_wpr_task = None
+
+  def CreateSandwichRunner(self):
+    """Create a runner for non benchmark purposes."""
+    runner = sandwich_runner.SandwichRunner()
+    runner.url = self._url
+    runner.android_device = self._android_device
+    return runner
+
+  def OverridePathToWprArchive(self, original_wpr_path):
+    """Sets the original WPR archive path's to be used.
+
+    Args:
+      original_wpr_path: Path of the original WPR archive to be used.
+    """
+    self.original_wpr_task = \
+        self.CreateStaticTask('common/webpages.wpr', original_wpr_path)
+
+  def PopulateWprRecordingTask(self):
+    """Records the original WPR archive."""
+    @self.RegisterTask('common/webpages.wpr')
+    def BuildOriginalWpr():
+      common_util.EnsureParentDirectoryExists(BuildOriginalWpr.path)
+      runner = self.CreateSandwichRunner()
+      runner.wpr_archive_path = BuildOriginalWpr.path
+      runner.wpr_record = True
+      runner.Run()
+
+    self.original_wpr_task = BuildOriginalWpr