Add entry point of creating texture view by TextureViewDescriptor

This patch adds the entry point creating texture view with a
TextureViewDescriptor and all the validations on the parameters
according to https://github.com/gpuweb/gpuweb/issues/79.

BUG=dawn:16
TEST=dawn_unittests

Change-Id: Ibc04a0f7b9f334c57da191606313ab156e18af1f
Reviewed-on: https://dawn-review.googlesource.com/c/1800
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>

src/dawn_native/opengl/DeviceGL.cpp

@@ -109,6 +109,12 @@ namespace dawn_native { namespace opengl {
     TextureViewBase* Device::CreateDefaultTextureView(TextureBase* texture) {
         return new TextureView(texture);
     }
+    // TODO(jiawei.shao@intel.com): implement creating texture view with TextureViewDescriptor
+    ResultOrError<TextureViewBase*> Device::CreateTextureViewImpl(
+        TextureBase* texture,
+        const TextureViewDescriptor* descriptor) {
+        return DAWN_UNIMPLEMENTED_ERROR("Creating texture view with descriptor is unimplemented.");
+    }
 
     void Device::TickImpl() {
     }

src/dawn_native/opengl/DeviceGL.h

@@ -62,6 +62,9 @@ namespace dawn_native { namespace opengl {
         ResultOrError<ShaderModuleBase*> CreateShaderModuleImpl(
             const ShaderModuleDescriptor* descriptor) override;
         ResultOrError<TextureBase*> CreateTextureImpl(const TextureDescriptor* descriptor) override;
+        ResultOrError<TextureViewBase*> CreateTextureViewImpl(
+            TextureBase* texture,
+            const TextureViewDescriptor* descriptor) override;
         void CollectPCIInfo();
 
         dawn_native::PCIInfo mPCIInfo;