Telemetry: makes profilers a bit more generic.

tools/telemetry/telemetry/core/platform/profiler/__init__.py

Index: tools/telemetry/telemetry/core/platform/profiler/__init__.py
diff --git a/tools/telemetry/telemetry/core/platform/profiler/__init__.py b/tools/telemetry/telemetry/core/platform/profiler/__init__.py
index 4fd39e16cd9a3cedb5a1b0a43655859bc35e8d26..f7b78c1ba430aa075691b7ee1953c1cd8ef398f2 100644
--- a/tools/telemetry/telemetry/core/platform/profiler/__init__.py
+++ b/tools/telemetry/telemetry/core/platform/profiler/__init__.py
@@ -2,11 +2,15 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import collections
+
 class Profiler(object):
   """A sampling profiler provided by the platform."""
 
-  def __init__(self, output_path):
-    self.output_path = output_path
+  def __init__(self, browser_backend, platform_backend, output_path):
+    self._browser_backend = browser_backend
+    self._platform_backend = platform_backend
+    self._output_path = output_path
 
   @classmethod
   def name(cls):
@@ -18,6 +22,22 @@ class Profiler(object):
     """True iff this profiler is currently supported by the platform."""
     raise NotImplementedError()
 
+  def _GetProcessOutputFileMap(self):
+    """Returns a dict with pid: output_file."""
+    all_pids = ([self._browser_backend.pid] +
+                self._platform_backend.GetChildPids(self._browser_backend.pid))
+
+    process_name_counts = collections.defaultdict(int)
+    process_output_file_map = {}
+    for pid in all_pids:
+      cmd_line = self._platform_backend.GetCommandLine(pid)
+      process_name = self._browser_backend.GetProcessName(cmd_line)
+      output_file = '%s.%s%s' % (self._output_path, process_name,
+                                 process_name_counts[process_name])
+      process_name_counts[process_name] += 1
+      process_output_file_map[pid] = output_file
+    return process_output_file_map
+
   def CollectProfile(self):
     """Collect the profile from the profiler."""
     raise NotImplementedError()