Add SetLowPriorityProcess to utils and use it in dEQP support

This provides a cross-platform way to make sure dEQP runs in a low
priority process.

BUG=angleproject:892

Change-Id: I0d12f1eacb78be43edcdb6622f945734c0b377ff
Reviewed-on: https://chromium-review.googlesource.com/273595
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Corentin Wallez <cwallez@chromium.org>

src/tests/deqp.gypi

@@ -1056,6 +1056,7 @@
                             'dependencies':
                             [
                                 'angle_deqp_libtester',
+                                '<(angle_path)/util/util.gyp:angle_util',
                             ],
                             'defines':
                             [
@@ -1075,6 +1076,7 @@
                             'dependencies':
                             [
                                 'angle_deqp_libtester',
+                                '<(angle_path)/util/util.gyp:angle_util',
                             ],
                             'defines':
                             [

src/tests/deqp_support/tcuANGLEWin32Platform.cpp

@@ -24,6 +24,7 @@
 #include <EGL/eglext.h>
 
 #include "egluGLContextFactory.hpp"
+#include "system_utils.h"
 #include "tcuANGLEWin32NativeDisplayFactory.h"
 #include "tcuNullContextFactory.hpp"
 
@@ -32,9 +33,7 @@ namespace tcu
 
 ANGLEWin32Platform::ANGLEWin32Platform()
 {
-    // Set process priority to lower.
-    // TODO(cwallez): add this to utils
-    SetPriorityClass(GetCurrentProcess(), BELOW_NORMAL_PRIORITY_CLASS);
+    angle::SetLowPriorityProcess();
 
 #if defined(ANGLE_DEQP_GLES2_TESTS) || defined(ANGLE_DEQP_GLES3_TESTS)
     std::vector<eglw::EGLAttrib> d3d11Attribs;

src/tests/deqp_support/tcuANGLEWin32Platform.h

@@ -24,7 +24,6 @@
 #include "tcuDefs.hpp"
 #include "tcuPlatform.hpp"
 #include "gluPlatform.hpp"
-#include "tcuWin32API.h"
 
 #ifndef _EGLUPLATFORM_HPP
 #   include "egluPlatform.hpp"

util/linux/Linux_system_utils.cpp

@@ -8,7 +8,10 @@
 
 #include "system_utils.h"
 
+#include <sys/resource.h>
 #include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
 #include <unistd.h>
 #include <array>
 
@@ -38,4 +41,9 @@ std::string GetExecutableDirectory()
     return (lastPathSepLoc != std::string::npos) ? executablePath.substr(0, lastPathSepLoc) : "";
 }
 
+void SetLowPriorityProcess()
+{
+    setpriority(PRIO_PROCESS, getpid(), 10);
+}
+
 } // namespace angle

util/system_utils.h

@@ -20,6 +20,8 @@ std::string GetExecutableDirectory();
 // Cross platform equivalent of the Windows Sleep function
 void Sleep(unsigned int milliseconds);
 
+void SetLowPriorityProcess();
+
 } // namespace angle
 
 #endif // SAMPLE_UTIL_PATH_UTILS_H

util/win32/Win32_system_utils.cpp

@@ -33,4 +33,9 @@ void Sleep(unsigned int milliseconds)
     ::Sleep(static_cast<DWORD>(milliseconds));
 }
 
+void SetLowPriorityProcess()
+{
+    SetPriorityClass(GetCurrentProcess(), BELOW_NORMAL_PRIORITY_CLASS);
+}
+
 } // namespace angle