add a way to access the version string of the h/w implementation of EGL

we use a hidden egl extension. the version string is printed
in SF's dumpsys log.

Change-Id: I123eb4bde6de462bb2404c67b74d6d6219a48d6a
diff --git a/opengl/libs/EGL/eglApi.cpp b/opengl/libs/EGL/eglApi.cpp
index a63d5b0..2b0ed5d 100644
--- a/opengl/libs/EGL/eglApi.cpp
+++ b/opengl/libs/EGL/eglApi.cpp
@@ -49,6 +49,8 @@
 
 // ----------------------------------------------------------------------------
 
+#define EGL_VERSION_HW_ANDROID  0x3143
+
 struct extention_map_t {
     const char* name;
     __eglMustCastToProperFunctionPointerType address;
@@ -972,6 +974,12 @@
             return dp->getExtensionString();
         case EGL_CLIENT_APIS:
             return dp->getClientApiString();
+        case EGL_VERSION_HW_ANDROID: {
+            if (gEGLImpl[IMPL_HARDWARE].dso) {
+                return dp->disp[IMPL_HARDWARE].queryString.version;
+            }
+            return dp->disp[IMPL_SOFTWARE].queryString.version;
+        }
     }
     return setError(EGL_BAD_PARAMETER, (const char *)0);
 }