Display GL window system binding information in about:gpu

This patch adds information about the GL window system binding layer
implementation to about:gpu. Depending on which binding layer is used,
the following information is displayed:

- EGL: vendor, version, extension string
- GLX: vendor, version, extension string
- WGL: extension string

TEST=Check that the above shows up in about:gpu

Review URL: https://chromiumcodereview.appspot.com/15890002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@203167 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 20 insertions, 0 deletions

diff --git a/ui/gl/gl_glx_api_implementation.cc b/ui/gl/gl_glx_api_implementation.cc
index f8e75a2..4a43534 100644
--- a/ui/gl/gl_glx_api_implementation.cc
+++ b/ui/gl/gl_glx_api_implementation.cc
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include "ui/gl/gl_glx_api_implementation.h"
+#include "ui/gl/gl_implementation.h"
 
 namespace gfx {
 
@@ -64,6 +65,25 @@ void RealGLXApi::Initialize(DriverGLX* driver) {
 TraceGLXApi::~TraceGLXApi() {
 }
 
+bool GetGLWindowSystemBindingInfoGLX(GLWindowSystemBindingInfo* info) {
+  Display* display = glXGetCurrentDisplay();
+  const int kDefaultScreen = 0;
+  const char* vendor =
+      glXQueryServerString(display, kDefaultScreen, GLX_VENDOR);
+  const char* version =
+      glXQueryServerString(display, kDefaultScreen, GLX_VERSION);
+  const char* extensions =
+      glXQueryServerString(display, kDefaultScreen, GLX_EXTENSIONS);
+  *info = GLWindowSystemBindingInfo();
+  if (vendor)
+    info->vendor = vendor;
+  if (version)
+    info->version = version;
+  if (extensions)
+    info->extensions = extensions;
+  return true;
+}
+
 }  // namespace gfx