Revert of Remove all reference to carbon api

webrtc/base/macwindowpicker.cc

Index: webrtc/base/macwindowpicker.cc
diff --git a/webrtc/base/macwindowpicker.cc b/webrtc/base/macwindowpicker.cc
index d43d0e8cbfbd6a5385fb2934e6d20f81609e2b7b..bb97d20f1ac493caceab92eca813b5558a0931bf 100644
--- a/webrtc/base/macwindowpicker.cc
+++ b/webrtc/base/macwindowpicker.cc
@@ -106,7 +106,74 @@
 }
 
 bool MacWindowPicker::MoveToFront(const WindowId& id) {
-  return false;
+  // Init if we're not already initialized.
+  if (get_window_list_desc_ == NULL && !Init()) {
+    return false;
+  }
+  CGWindowID ids[1];
+  ids[0] = id.id();
+  CFArrayRef window_id_array =
+      CFArrayCreate(NULL, reinterpret_cast<const void **>(&ids), 1, NULL);
+
+  CFArrayRef window_array =
+      reinterpret_cast<CGWindowListCreateDescriptionFromArrayProc>(
+          get_window_list_desc_)(window_id_array);
+  if (window_array == NULL || 0 == CFArrayGetCount(window_array)) {
+    // Could not find the window. It might have been closed.
+    LOG(LS_INFO) << "Window not found";
+    CFRelease(window_id_array);
+    return false;
+  }
+
+  CFDictionaryRef window = reinterpret_cast<CFDictionaryRef>(
+      CFArrayGetValueAtIndex(window_array, 0));
+  CFStringRef window_name_ref = reinterpret_cast<CFStringRef>(
+      CFDictionaryGetValue(window, kCGWindowName));
+  CFNumberRef application_pid = reinterpret_cast<CFNumberRef>(
+      CFDictionaryGetValue(window, kCGWindowOwnerPID));
+
+  int pid_val;
+  CFNumberGetValue(application_pid, kCFNumberIntType, &pid_val);
+  std::string window_name;
+  ToUtf8(window_name_ref, &window_name);
+
+  // Build an applescript that sets the selected window to front
+  // within the application. Then set the application to front.
+  bool result = true;
+  std::stringstream ss;
+  ss << "tell application \"System Events\"\n"
+     << "set proc to the first item of (every process whose unix id is "
+     << pid_val
+     << ")\n"
+     << "tell proc to perform action \"AXRaise\" of window \""
+     << window_name
+     << "\"\n"
+     << "set the frontmost of proc to true\n"
+     << "end tell";
+  if (!RunAppleScript(ss.str())) {
+    // This might happen to for example X applications where the X
+    // server spawns of processes with their own PID but the X server
+    // is still registered as owner to the application windows. As a
+    // workaround, we put the X server process to front, meaning that
+    // all X applications will show up. The drawback with this
+    // workaround is that the application that we really wanted to set
+    // to front might be behind another X application.
+    ProcessSerialNumber psn;
+    pid_t pid = pid_val;
+    int res = GetProcessForPID(pid, &psn);
+    if (res != 0) {
+      LOG(LS_ERROR) << "Failed getting process for pid";
+      result = false;
+    }
+    res = SetFrontProcess(&psn);
+    if (res != 0) {
+      LOG(LS_ERROR) << "Failed setting process to front";
+      result = false;
+    }
+  }
+  CFRelease(window_id_array);
+  CFRelease(window_array);
+  return result;
 }
 
 bool MacWindowPicker::GetDesktopList(DesktopDescriptionList* descriptions) {