Fix tab backgrounding on Linux / ChromeOS

base/process.h

Index: base/process.h
diff --git a/base/process.h b/base/process.h
index 267092479ca6c8219c885f99bbff0721543d7eb3..7869b886455a9826f968e7a189bcbd27bf020d96 100644
--- a/base/process.h
+++ b/base/process.h
@@ -34,37 +34,24 @@ const ProcessHandle kNullProcessHandle = 0;
 const ProcessId kNullProcessId = 0;
 #endif  // defined(OS_WIN)
 
-#if defined(OS_POSIX) && !defined(OS_MACOSX)
-// saved_priority_ will be set to this to indicate that it's not holding
-// a valid value. -20 to 19 are valid process priorities.
-const int kUnsetProcessPriority = 256;
-#endif
-
 class BASE_EXPORT Process {
  public:
   Process() : process_(kNullProcessHandle) {
-#if defined(OS_POSIX) && !defined(OS_MACOSX)
-    saved_priority_ = kUnsetProcessPriority;
-#endif
   }
 
   explicit Process(ProcessHandle handle) : process_(handle) {
-#if defined(OS_POSIX) && !defined(OS_MACOSX)
-    saved_priority_ = kUnsetProcessPriority;
-#endif
   }
 
   // A handle to the current process.
   static Process Current();
 
+  static bool CanBackgroundProcesses();
+
   // Get/Set the handle for this process. The handle will be 0 if the process
   // is no longer running.
   ProcessHandle handle() const { return process_; }
   void set_handle(ProcessHandle handle) {
     process_ = handle;
-#if defined(OS_POSIX) && !defined(OS_MACOSX)
-    saved_priority_ = kUnsetProcessPriority;
-#endif
   }
 
   // Get the PID for this process.
@@ -98,11 +85,6 @@ class BASE_EXPORT Process {
 
  private:
   ProcessHandle process_;
-#if defined(OS_POSIX) && !defined(OS_MACOSX)
-  // Holds the priority that the process was set to when it was backgrounded.
-  // If the process wasn't backgrounded it will be kUnsetProcessPriority.
-  int saved_priority_;
-#endif
 };
 
 }  // namespace base