This adds some plumbing for propagating the status and error code of a

renderer process that went away so that we can tell at the UI level
what happened to the tab: did it crash, or was it killed by the OOM
killer (or some other reason). This is in preparation for implementing
a new UI for when a process is killed by the OOM on ChromeOS which
handles it differently from a crash.

Most of the changes are modifications of the argument list to include
a status and error code for the exited process, but in addition the
following was done:

- Changed the name of DidProcessCrash to GetTerminationStatus.
- Added some new enum values to TerminationStatus enum (and named it)
in process_util.h, so it can be used as the status returned by
WhatHappenedToProcess.
- Improved process_util_unittest to actually test for crashing and
terminated processes on all platforms.
- Added a new notification for renderers that were killed.
- Added error code information to crash notification.
- Added status and error code information to renderer IPC message for
RenderViewGone.
- Added a UMA histogram count for number of renderer kills.

[This change was previously reviewed and LGTM'd:
http://codereview.chromium.org/3386014/show
but due to issues with "git cl push" was never committed to the tree.]

BUG=none
TEST=ran new unit test. Test passes on try servers.

Review URL: http://codereview.chromium.org/3869001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@63067 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 38 insertions, 25 deletions

diff --git a/base/process_util_win.cc b/base/process_util_win.cc
index 92077b1..3c0663f 100644
--- a/base/process_util_win.cc
+++ b/base/process_util_win.cc
@@ -394,22 +394,33 @@ bool KillProcess(ProcessHandle process, int exit_code, bool wait) {
   return result;
 }
 
-bool DidProcessCrash(bool* child_exited, ProcessHandle handle) {
-  DWORD exitcode = 0;
+TerminationStatus GetTerminationStatus(ProcessHandle handle, int* exit_code) {
+  DWORD tmp_exit_code = 0;
 
-  if (!::GetExitCodeProcess(handle, &exitcode)) {
+  if (!::GetExitCodeProcess(handle, &tmp_exit_code)) {
     NOTREACHED();
-    // Assume the child has exited.
-    if (child_exited)
-      *child_exited = true;
-    return false;
+    if (exit_code) {
+      // This really is a random number.  We haven't received any
+      // information about the exit code, presumably because this
+      // process doesn't have permission to get the exit code, or
+      // because of some other cause for GetExitCodeProcess to fail
+      // (MSDN docs don't give the possible failure error codes for
+      // this function, so it could be anything).  But we don't want
+      // to leave exit_code uninitialized, since that could cause
+      // random interpretations of the exit code.  So we assume it
+      // terminated "normally" in this case.
+      *exit_code = TERMINATION_STATUS_NORMAL_TERMINATION;
+    }
+    // Assume the child has exited normally if we can't get the exit
+    // code.
+    return TERMINATION_STATUS_NORMAL_TERMINATION;
   }
-  if (exitcode == STILL_ACTIVE) {
+  if (tmp_exit_code == STILL_ACTIVE) {
     DWORD wait_result = WaitForSingleObject(handle, 0);
     if (wait_result == WAIT_TIMEOUT) {
-      if (child_exited)
-        *child_exited = false;
-      return false;
+      if (exit_code)
+        *exit_code = wait_result;
+      return TERMINATION_STATUS_STILL_RUNNING;
     }
 
     DCHECK_EQ(WAIT_OBJECT_0, wait_result);
@@ -417,27 +428,29 @@ bool DidProcessCrash(bool* child_exited, ProcessHandle handle) {
     // Strange, the process used 0x103 (STILL_ACTIVE) as exit code.
     NOTREACHED();
 
-    return false;
+    return TERMINATION_STATUS_ABNORMAL_TERMINATION;
   }
 
-  // We're sure the child has exited.
-  if (child_exited)
-    *child_exited = true;
+  if (exit_code)
+    *exit_code = tmp_exit_code;
 
   // Warning, this is not generic code; it heavily depends on the way
   // the rest of the code kills a process.
 
-  if (exitcode == PROCESS_END_NORMAL_TERMINATION ||
-      exitcode == PROCESS_END_KILLED_BY_USER ||
-      exitcode == PROCESS_END_PROCESS_WAS_HUNG ||
-      exitcode == 0xC0000354 ||     // STATUS_DEBUGGER_INACTIVE.
-      exitcode == 0xC000013A ||     // Control-C/end session.
-      exitcode == 0x40010004) {     // Debugger terminated process/end session.
-    return false;
+  switch (tmp_exit_code) {
+    case PROCESS_END_NORMAL_TERMINATION:
+      return TERMINATION_STATUS_NORMAL_TERMINATION;
+    case 0xC0000354:  // STATUS_DEBUGGER_INACTIVE.
+    case 0xC000013A:  // Control-C/end session.
+    case 0x40010004:  // Debugger terminated process/end session.
+    case PROCESS_END_PROCESS_WAS_KILLED:  // Task manager kill.
+      return TERMINATION_STATUS_PROCESS_WAS_KILLED;
+    case PROCESS_END_PROCESS_WAS_HUNG:
+      return TERMINATION_STATUS_PROCESS_WAS_HUNG;
+    default:
+      // All other exit codes indicate crashes.
+      return TERMINATION_STATUS_PROCESS_CRASHED;
   }
-
-  // All other exit codes indicate crashes.
-  return true;
 }
 
 bool WaitForExitCode(ProcessHandle handle, int* exit_code) {