Fix missing query for GL_NUM_REQUESTABLE_EXTENSIONS_ANGLE.

This enum was validated but not implemented.

TEST=RequestExtensionTest.Queries

BUG=890689

Change-Id: I7285e45cef53b197d61cd0dfa9d2bacb70e23e64
Reviewed-on: https://chromium-review.googlesource.com/1255142
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@google.com>
Commit-Queue: Geoff Lang <geofflang@chromium.org>

src/libANGLE/Context.cpp

@@ -1603,6 +1603,11 @@ void Context::getIntegervImpl(GLenum pname, GLint *params)
             *params = static_cast<GLint>(mExtensionStrings.size());
             break;
 
+        // GL_ANGLE_request_extension
+        case GL_NUM_REQUESTABLE_EXTENSIONS_ANGLE:
+            *params = static_cast<GLint>(mRequestableExtensionStrings.size());
+            break;
+
         // GL_KHR_debug
         case GL_MAX_DEBUG_MESSAGE_LENGTH:
             *params = mExtensions.maxDebugMessageLength;

src/tests/gl_tests/RequestExtensionTest.cpp

@@ -34,12 +34,46 @@ TEST_P(RequestExtensionTest, ExtensionsDisabledByDefault)
     }
 }
 
+// Test the queries for the requestable extension strings
+TEST_P(RequestExtensionTest, Queries)
+{
+    ANGLE_SKIP_TEST_IF(!extensionEnabled("GL_ANGLE_request_extension"));
+
+    const GLubyte *requestableExtString = glGetString(GL_REQUESTABLE_EXTENSIONS_ANGLE);
+    EXPECT_GL_NO_ERROR();
+    EXPECT_NE(nullptr, requestableExtString);
+
+    if (getClientMajorVersion() >= 3)
+    {
+        GLint numExtensions = 0;
+        glGetIntegerv(GL_NUM_REQUESTABLE_EXTENSIONS_ANGLE, &numExtensions);
+        EXPECT_GL_NO_ERROR();
+
+        for (GLint extIdx = 0; extIdx < numExtensions; extIdx++)
+        {
+            const GLubyte *requestableExtIndexedString =
+                glGetStringi(GL_REQUESTABLE_EXTENSIONS_ANGLE, extIdx);
+            EXPECT_GL_NO_ERROR();
+            EXPECT_NE(nullptr, requestableExtIndexedString);
+        }
+
+        // Request beyond the end of the array
+        const GLubyte *requestableExtIndexedString =
+            glGetStringi(GL_REQUESTABLE_EXTENSIONS_ANGLE, numExtensions);
+        EXPECT_GL_ERROR(GL_INVALID_VALUE);
+        EXPECT_EQ(nullptr, requestableExtIndexedString);
+    }
+}
+
 // Use this to select which configurations (e.g. which renderer, which GLES major version) these
 // tests should be run against.
 ANGLE_INSTANTIATE_TEST(RequestExtensionTest,
                        ES2_D3D11(),
+                       ES3_D3D11(),
                        ES2_OPENGL(),
+                       ES3_OPENGL(),
                        ES2_OPENGLES(),
+                       ES3_OPENGLES(),
                        ES2_VULKAN());
 
 }  // namespace angle