fuchsia: stub unavailable functions

GetSystemCommitCharge() isn't available. It likely won't be as the
general system design doesn't allow a process much information other
than about itself.

EnableTerminationOnHeapCorruption() doesn't have an analog (at least
today).

GetParentProcessId() doesn't have a direct mapping. We could retrieve
the parent job, but that wouldn't be a process. In any case, getppid()
isn't implemented, so the test would currently fail.

Bug: 706592
Change-Id: I218f80d92a64e92ac3f49aa21ec55ef522cd0435
Reviewed-on: https://chromium-review.googlesource.com/516523
Commit-Queue: Scott Graham <scottmg@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#474956}

base/BUILD.gn

@@ -1250,8 +1250,10 @@ component("base") {
       "message_loop/message_pump_fuchsia.h",
       "process/kill_fuchsia.cc",
       "process/launch_fuchsia.cc",
+      "process/memory_fuchsia.cc",
       "process/process_fuchsia.cc",
       "process/process_handle_fuchsia.cc",
+      "process/process_metrics_fuchsia.cc",
       "sys_info_fuchsia.cc",
       "threading/platform_thread_fuchsia.cc",
       "time/time_conversion_posix.cc",

base/process/memory_fuchsia.cc

+// Copyright 2017 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.
+
+#include "base/process/memory.h"
+
+namespace base {
+
+void EnableTerminationOnHeapCorruption() {
+  // Nothing to be done here.
+}
+
+}  // namespace base

base/process/process_handle.h

@@ -77,8 +77,10 @@ BASE_EXPORT ProcessHandle GetCurrentProcessHandle();
 // processes.
 BASE_EXPORT ProcessId GetProcId(ProcessHandle process);
 
-// Returns the ID for the parent of the given process.
+#if !defined(OS_FUCHSIA)
+// Returns the ID for the parent of the given process. Not available on Fuchsia.
 BASE_EXPORT ProcessId GetParentProcessId(ProcessHandle process);
+#endif  // !defined(OS_FUCHSIA)
 
 #if defined(OS_POSIX)
 // Returns the path to the executable of the given process.

base/process/process_metrics_fuchsia.cc

+// Copyright 2017 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.
+
+#include "base/process/process_metrics.h"
+
+namespace base {
+
+size_t GetSystemCommitCharge() {
+  // Not available, doesn't seem likely that it will be (for the whole system).
+  NOTIMPLEMENTED();
+  return 0;
+}
+
+}  // namespace bse

base/process/process_util_unittest.cc

@@ -858,11 +858,14 @@ TEST_F(ProcessUtilTest, GetAppOutputWithExitCode) {
   EXPECT_EQ(exit_code, 2);
 }
 
+// There's no such thing as a parent process id on Fuchsia.
+#if !defined(OS_FUCHSIA)
 TEST_F(ProcessUtilTest, GetParentProcessId) {
   base::ProcessId ppid =
       base::GetParentProcessId(base::GetCurrentProcessHandle());
   EXPECT_EQ(ppid, static_cast<base::ProcessId>(getppid()));
 }
+#endif  // !defined(OS_FUCHSIA)
 
 // TODO(port): port those unit tests.
 bool IsProcessDead(base::ProcessHandle child) {