gpu: Introduce separate mojo api for failed initialization.

gpu/ipc/common/gpu_feature_info_struct_traits.h

Index: gpu/ipc/common/gpu_feature_info_struct_traits.h
diff --git a/gpu/ipc/common/gpu_feature_info_struct_traits.h b/gpu/ipc/common/gpu_feature_info_struct_traits.h
new file mode 100644
index 0000000000000000000000000000000000000000..29ed84062b6404422afb27c332f589766c143645
--- /dev/null
+++ b/gpu/ipc/common/gpu_feature_info_struct_traits.h
@@ -0,0 +1,76 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef GPU_IPC_COMMON_GPU_FEATURE_INFO_STRUCT_TRAITS_H_
+#define GPU_IPC_COMMON_GPU_FEATURE_INFO_STRUCT_TRAITS_H_
+
+#include "gpu/config/gpu_feature_info.h"
+
+namespace mojo {
+
+template <>
+struct EnumTraits<gpu::mojom::GpuFeatureStatus, gpu::GpuFeatureStatus> {
+  static gpu::mojom::GpuFeatureStatus ToMojom(gpu::GpuFeatureStatus status) {
+    switch (status) {
+      case gpu::kGpuFeatureStatusEnabled:
+        return gpu::mojom::GpuFeatureStatus::Enabled;
+      case gpu::kGpuFeatureStatusBlacklisted:
+        return gpu::mojom::GpuFeatureStatus::Blacklisted;
+      case gpu::kGpuFeatureStatusDisabled:
+        return gpu::mojom::GpuFeatureStatus::Disabled;
+      case gpu::kGpuFeatureStatusUndefined:
+        return gpu::mojom::GpuFeatureStatus::Undefined;
+      case gpu::kGpuFeatureStatusMax:
+        return gpu::mojom::GpuFeatureStatus::Max;
+    }
+    NOTREACHED();
+    return gpu::mojom::GpuFeatureStatus::Max;
+  }
+
+  static bool FromMojom(gpu::mojom::GpuFeatureStatus input,
+                        gpu::GpuFeatureStatus* out) {
+    switch (input) {
+      case gpu::mojom::GpuFeatureStatus::Enabled:
+        *out = gpu::kGpuFeatureStatusEnabled;
+        return true;
+      case gpu::mojom::GpuFeatureStatus::Blacklisted:
+        *out = gpu::kGpuFeatureStatusBlacklisted;
+        return true;
+      case gpu::mojom::GpuFeatureStatus::Disabled:
+        *out = gpu::kGpuFeatureStatusDisabled;
+        return true;
+      case gpu::mojom::GpuFeatureStatus::Undefined:
+        *out = gpu::kGpuFeatureStatusUndefined;
+        return true;
+      case gpu::mojom::GpuFeatureStatus::Max:
+        *out = gpu::kGpuFeatureStatusMax;
+        return true;
+    }
+    return false;
+  }
+};
+
+template <>
+struct StructTraits<gpu::mojom::GpuFeatureInfoDataView, gpu::GpuFeatureInfo> {
+  static bool Read(gpu::mojom::GpuFeatureInfoDataView data,
+                   gpu::GpuFeatureInfo* out) {
+    std::vector<gpu::GpuFeatureStatus> info_status;
+    if (!data.ReadStatusValues(&info_status))
+      return false;
+    if (info_status.size() != gpu::NUMBER_OF_GPU_FEATURE_TYPES)
+      return false;
+    std::copy(info_status.begin(), info_status.end(), out->status_values);
+    return true;
+  }
+
+  static std::vector<gpu::GpuFeatureStatus> status_values(
+      const gpu::GpuFeatureInfo& info) {
+    return std::vector<gpu::GpuFeatureStatus>(info.status_values,
+                                              std::end(info.status_values));
+  }
+};
+
+}  // namespace mojo
+
+#endif  // GPU_IPC_COMMON_GPU_FEATURE_INFO_STRUCT_TRAITS_H_