Fix browser.memory_stats has no GPU and Renderer info on CrOS

tools/telemetry/telemetry/core/platform/cros_platform_backend.py

Index: tools/telemetry/telemetry/core/platform/cros_platform_backend.py
diff --git a/tools/telemetry/telemetry/core/platform/cros_platform_backend.py b/tools/telemetry/telemetry/core/platform/cros_platform_backend.py
index 02f6a71b89d67e6c3653ead29085228b978308d5..af2312f6525d4e321f0d104c00d08a91196e9c6b 100644
--- a/tools/telemetry/telemetry/core/platform/cros_platform_backend.py
+++ b/tools/telemetry/telemetry/core/platform/cros_platform_backend.py
@@ -56,14 +56,13 @@ class CrosPlatformBackend(platform_backend.PlatformBackend):
   def GetChildPids(self, pid):
     """Returns a list of child pids of |pid|."""
     all_process_info = self._cri.ListProcesses()
-    processes = []
-    for pid, _, ppid, state in all_process_info:
-      processes.append((pid, ppid, state))
+    processes = [(curr_pid, curr_ppid, curr_state)
+                 for curr_pid, _, curr_ppid, curr_state in all_process_info]
     return proc_util.GetChildPids(processes, pid)

[Owen Lin, 2013/09/03 06:42:51]

"pid" has been overwrite in the for loop

 
   def GetCommandLine(self, pid):

[Owen Lin, 2013/09/03 06:42:51]

CrosPlatformBackend is no longer a PosixPlatformBackend by the change:
https://chromiumcodereview.appspot.com/20766003/#ps40001
So there is no "_GetPsOutput" anymore.

-    command = self._GetPsOutput(['command'], pid)
-    return command[0] if command else None
+    command = self._GetFileContents('/proc/%s/cmdline' % pid)
+    return command if command else None
 
   def CanFlushIndividualFilesFromSystemCache(self):
     return True