adb_profile_chrome: Refactor into multiple modules and add tests

build/android/chrome_profiler/profiler.py

Index: build/android/chrome_profiler/profiler.py
diff --git a/build/android/chrome_profiler/profiler.py b/build/android/chrome_profiler/profiler.py
new file mode 100644
index 0000000000000000000000000000000000000000..019d3c02a55a5781c0b3587655520fa41fa34113
--- /dev/null
+++ b/build/android/chrome_profiler/profiler.py
@@ -0,0 +1,130 @@
+# Copyright 2014 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 gzip
+import os
+import shutil
+import sys
+import zipfile
+
+from chrome_profiler import ui
+from chrome_profiler import util
+
+from pylib import constants
+
+sys.path.append(os.path.join(constants.DIR_SOURCE_ROOT,
+                             'third_party',
+                             'trace-viewer'))
+# pylint: disable=F0401
+from trace_viewer.build import trace2html
+
+
+def _CompressFile(host_file, output):
+  with gzip.open(output, 'wb') as out:
+    with open(host_file, 'rb') as input_file:
+      out.write(input_file.read())
+  os.unlink(host_file)
+
+
+def _ArchiveFiles(host_files, output):
+  with zipfile.ZipFile(output, 'w', zipfile.ZIP_DEFLATED) as z:
+    for host_file in host_files:
+      z.write(host_file)
+      os.unlink(host_file)
+
+
+def _PackageTracesAsHtml(trace_files, html_file):
+  with open(html_file, 'w') as f:
+    trace2html.WriteHTMLForTracesToFile(trace_files, f)
+  for trace_file in trace_files:
+    os.unlink(trace_file)
+
+
+def _StartTracing(controllers, interval):
+  for controller in controllers:
+    controller.StartTracing(interval)
+
+
+def _StopTracing(controllers):
+  for controller in controllers:
+    controller.StopTracing()
+
+
+def _PullTraces(controllers, output, compress, write_json):
+  ui.PrintMessage('Downloading...', eol='')
+  trace_files = []
+  for controller in controllers:
+    trace_files.append(controller.PullTrace())
+
+  if not write_json:
+    html_file = os.path.splitext(trace_files[0])[0] + '.html'
+    _PackageTracesAsHtml(trace_files, html_file)
+    trace_files = [html_file]
+
+  if compress and len(trace_files) == 1:
+    result = output or trace_files[0] + '.gz'
+    _CompressFile(trace_files[0], result)
+  elif len(trace_files) > 1:
+    result = output or 'chrome-combined-trace-%s.zip' % util.GetTraceTimestamp()
+    _ArchiveFiles(trace_files, result)
+  elif output:
+    result = output
+    shutil.move(trace_files[0], result)
+  else:
+    result = trace_files[0]
+
+  ui.PrintMessage('done')
+  ui.PrintMessage('Trace written to file://%s' % os.path.abspath(result))
+  return result
+
+
+def GetSupportedBrowsers():
+  """Returns the package names of all supported browsers."""
+  # Add aliases for backwards compatibility.
+  supported_browsers = {
+    'stable': constants.PACKAGE_INFO['chrome_stable'],
+    'beta': constants.PACKAGE_INFO['chrome_beta'],
+    'dev': constants.PACKAGE_INFO['chrome_dev'],
+    'build': constants.PACKAGE_INFO['chrome'],
+  }
+  supported_browsers.update(constants.PACKAGE_INFO)
+  unsupported_browsers = ['content_browsertests', 'gtest', 'legacy_browser']
+  for browser in unsupported_browsers:
+    del supported_browsers[browser]
+  return supported_browsers
+
+
+def CaptureProfile(controllers, interval, output=None, compress=False,
+                   write_json=False):
+  """Records a profiling trace saves the result to a file.
+
+  Args:
+    controllers: List of tracing controllers.
+    interval: Time interval to capture in seconds. An interval of None (or 0)
+        continues tracing until stopped by the user.
+    output: Output file name or None to use an automatically generated name.
+    compress: If True, the result will be compressed either with gzip or zip
+        depending on the number of captured subtraces.
+    write_json: If True, prefer JSON output over HTML.
+
+  Returns:
+    Path to saved profile.
+  """
+  trace_type = ' + '.join(map(str, controllers))
+  try:
+    _StartTracing(controllers, interval)
+    if interval:
+      ui.PrintMessage('Capturing %d-second %s. Press Enter to stop early...' % \
+          (interval, trace_type), eol='')
+      ui.WaitForEnter(interval)
+    else:
+      ui.PrintMessage('Capturing %s. Press Enter to stop...' % \
+          trace_type, eol='')
+      raw_input()
+  finally:
+    _StopTracing(controllers)
+  if interval:
+    ui.PrintMessage('done')
+
+  return _PullTraces(controllers, output, compress, write_json)