Add support for backgrounding processes on the Mac

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index 25fc7c063e2280a9ef57d021feda7fdd2ffee030..0f0d2432436ec721a52d92387371badf8dfced96 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -490,6 +490,7 @@ component("base") {
     "process/process_iterator_openbsd.cc",
     "process/process_iterator_win.cc",
     "process/process_linux.cc",
+    "process/process_mac.cc",
     "process/process_metrics.cc",
     "process/process_metrics.h",
     "process/process_metrics_freebsd.cc",
@@ -1499,8 +1500,8 @@ if (is_android) {
   # GYP: //base.gyp:base_jni_headers
   generate_jni("base_jni_headers") {
     sources = [
-      "android/java/src/org/chromium/base/ApplicationStatus.java",
       "android/java/src/org/chromium/base/AnimationFrameTimeHistogram.java",
+      "android/java/src/org/chromium/base/ApplicationStatus.java",
       "android/java/src/org/chromium/base/BuildInfo.java",
       "android/java/src/org/chromium/base/CommandLine.java",
       "android/java/src/org/chromium/base/ContentUriUtils.java",