Add helpers for checking EGL extension availablity in tests.

Also make sure that EGL_EGLEXT_PROTOTYPES is always defined so that
extension functions can be used without loading them.

BUG=angleproject:970

Change-Id: I33fa3e8ed68aeda55ad69e1bc7826646f5e3ce29
Reviewed-on: https://chromium-review.googlesource.com/287161
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>

src/tests/test_utils/ANGLETest.cpp

@@ -121,10 +121,25 @@ GLuint ANGLETest::compileShader(GLenum type, const std::string &source)
     return shader;
 }
 
+static bool checkExtensionExists(const char *allExtensions, const std::string &extName)
+{
+    return strstr(allExtensions, extName.c_str()) != nullptr;
+}
+
 bool ANGLETest::extensionEnabled(const std::string &extName)
 {
-    const char* extString = reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS));
-    return strstr(extString, extName.c_str()) != NULL;
+    return checkExtensionExists(reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)),
+                                extName);
+}
+
+bool ANGLETest::eglDisplayExtensionEnabled(EGLDisplay display, const std::string &extName)
+{
+    return checkExtensionExists(eglQueryString(display, EGL_EXTENSIONS), extName);
+}
+
+bool ANGLETest::eglClientExtensionEnabled(const std::string &extName)
+{
+    return checkExtensionExists(eglQueryString(EGL_NO_DISPLAY, EGL_EXTENSIONS), extName);
 }
 
 void ANGLETest::setWindowWidth(int width)

src/tests/test_utils/ANGLETest.h

@@ -7,6 +7,9 @@
 #ifndef ANGLE_TESTS_ANGLE_TEST_H_
 #define ANGLE_TESTS_ANGLE_TEST_H_
 
+#define GL_GLEXT_PROTOTYPES
+#define EGL_EGLEXT_PROTOTYPES
+
 #include <gtest/gtest.h>
 #include <algorithm>
 
@@ -76,6 +79,8 @@ class ANGLETest : public ::testing::TestWithParam<angle::PlatformParameters>
     static void drawQuad(GLuint program, const std::string& positionAttribName, GLfloat quadDepth, GLfloat quadScale = 1.0f);
     static GLuint compileShader(GLenum type, const std::string &source);
     static bool extensionEnabled(const std::string &extName);
+    static bool eglDisplayExtensionEnabled(EGLDisplay display, const std::string &extName);
+    static bool eglClientExtensionEnabled(const std::string &extName);
 
     void setWindowWidth(int width);
     void setWindowHeight(int height);

util/EGLWindow.h

@@ -8,6 +8,7 @@
 #define UTIL_EGLWINDOW_H_
 
 #define GL_GLEXT_PROTOTYPES
+#define EGL_EGLEXT_PROTOTYPES
 
 #include <GLES3/gl3.h>
 #include <GLES3/gl3ext.h>