Enable texture multisample extension on ES3 D3D

Update maxIntegerSamples, maxDepthTextureSamples and maxColorTextureSamples
if the extension is enabled on ES 3.0.

TEST=TextureMultisampleTest.*
TEST=NegativeTextureMultisampleTest.Negtive*

BUG=angleproject:2275

Change-Id: I8c215f990ff5d93611b1bc89de9a43f3d392e8d4
Reviewed-on: https://chromium-review.googlesource.com/c/1319251
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jiajia Qin <jiajia.qin@intel.com>
Commit-Queue: Yizhou Jiang <yizhou.jiang@intel.com>

src/libANGLE/Context.cpp

@@ -3401,7 +3401,7 @@ void Context::updateCaps()
         // OpenGL ES does not support multisampling with non-rendererable formats
         // OpenGL ES 3.0 or prior does not support multisampling with integer formats
         if (!formatCaps.renderbuffer ||
-            (getClientVersion() < ES_3_1 &&
+            (getClientVersion() < ES_3_1 && !mSupportedExtensions.textureMultisample &&
              (formatInfo.componentType == GL_INT || formatInfo.componentType == GL_UNSIGNED_INT)))
         {
             formatCaps.sampleCounts.clear();
@@ -3423,7 +3423,7 @@ void Context::updateCaps()
             }
 
             // Handle GLES 3.1 MAX_*_SAMPLES values similarly to MAX_SAMPLES.
-            if (getClientVersion() >= ES_3_1)
+            if (getClientVersion() >= ES_3_1 || mSupportedExtensions.textureMultisample)
             {
                 // GLES 3.1 section 9.2.5: "Implementations must support creation of renderbuffers
                 // in these required formats with up to the value of MAX_SAMPLES multisamples, with

src/libANGLE/renderer/d3d/d3d11/renderer11_utils.cpp

@@ -1629,6 +1629,7 @@ void GenerateCaps(ID3D11Device *device,
         (extensions->multiview && extensions->textureStorageMultisample2DArray);
     extensions->copyTexture3d      = true;
     extensions->textureBorderClamp = true;
+    extensions->textureMultisample = true;
 
     // D3D11 Feature Level 10_0+ uses SV_IsFrontFace in HLSL to emulate gl_FrontFacing.
     // D3D11 Feature Level 9_3 doesn't support SV_IsFrontFace, and has no equivalent, so can't

src/tests/gl_tests/TextureMultisampleTest.cpp

@@ -414,7 +414,6 @@ TEST_P(TextureMultisampleTest, CheckSamplePositions)
 // Test textureSize and texelFetch when using ANGLE_texture_multisample extension
 TEST_P(TextureMultisampleTest, SimpleTexelFetch)
 {
-    ANGLE_SKIP_TEST_IF(IsD3D11());
     ANGLE_SKIP_TEST_IF(!ensureExtensionEnabled("GL_ANGLE_texture_multisample"));
 
     ANGLE_GL_PROGRAM(texelFetchProgram, essl3_shaders::vs::Passthrough(),