OpenGL: implement GL_ANGLE_translated_shader_source

src/libANGLE/renderer/gl/ShaderGL.cpp

@@ -142,7 +142,7 @@ bool ShaderGL::postTranslateCompile(gl::Compiler *compiler, std::string *infoLog
 
 std::string ShaderGL::getDebugInfo() const
 {
-    return std::string();
+    return mData.getTranslatedSource();
 }
 
 GLuint ShaderGL::getShaderID() const

src/libANGLE/renderer/gl/renderergl_utils.cpp

@@ -900,6 +900,8 @@ void GenerateCaps(const FunctionsGL *functions, gl::Caps *caps, gl::TextureCapsM
                                      functions->isAtLeastGLES(gl::Version(3, 0)) ||
                                      functions->hasGLESExtension("GL_EXT_discard_framebuffer") ||
                                      functions->hasGLESExtension("GL_ARB_invalidate_subdata");
+
+    extensions->translatedShaderSource = true;
 }
 
 void GenerateWorkarounds(const FunctionsGL *functions, WorkaroundsGL *workarounds)