linux: implement some SysInfo bits to reduce NOTIMPL spew

base/sys_info_posix.cc

 // Copyright (c) 2008 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/sys_info.h"
 
 #include <errno.h>
 #include <string.h>
 #include <sys/statvfs.h>
 #include <sys/utsname.h>
 #include <unistd.h>
 
+#if !defined(OS_MACOSX)
+#include <gdk/gdk.h>
+#endif
+
 #if defined(OS_OPENBSD)
 #include <sys/param.h>
 #include <sys/sysctl.h>
 #endif
 
 #include "base/basictypes.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
 
@@ skipping 96 matching lines @@
   if (uname(&info) < 0) {
     NOTREACHED();
     return "";
   }
   return std::string(info.machine);
 }
 
 #if !defined(OS_MACOSX)
 // static
 void SysInfo::GetPrimaryDisplayDimensions(int* width, int* height) {
-  // TODO(port): http://crbug.com/21732
-  NOTIMPLEMENTED();
+  // Note that Bad Things Happen if this isn't called from the UI thread,
+  // but also that there's no way to check that from here.  :(
+  GdkScreen* screen = gdk_screen_get_default();
   if (width)
-    *width = 0;
+    *width = gdk_screen_get_width(screen);
   if (height)
-    *height = 0;
+    *height = gdk_screen_get_height(screen);
 }
 
 // static
 int SysInfo::DisplayCount() {
-  // TODO(port): http://crbug.com/21732
-  NOTIMPLEMENTED();
-  return 1;
+  // Note that Bad Things Happen if this isn't called from the UI thread,
+  // but also that there's no way to check that from here.  :(
+
+  // This query is kinda bogus for Linux -- do we want number of X screens?
+  // The number of monitors Xinerama has?  We'll just use whatever GDK uses.
+  GdkScreen* screen = gdk_screen_get_default();
+  return gdk_screen_get_n_monitors(screen);
 }
 #endif
 
 // static
 size_t SysInfo::VMAllocationGranularity() {
   return getpagesize();
 }
 
 #if defined(OS_LINUX)
 // static
 size_t SysInfo::MaxSharedMemorySize() {
   static size_t limit;
   static bool limit_valid = false;
 
   if (!limit_valid) {
     std::string contents;
     file_util::ReadFileToString(FilePath("/proc/sys/kernel/shmmax"), &contents);
     limit = strtoul(contents.c_str(), NULL, 0);
     limit_valid = true;
   }
 
   return limit;
 }
 #endif
 
 }  // namespace base