Return true in BufferFormat enum traits when format is UYVY_422

Added the missing return true and unit tests for both BufferFormat and
BufferUsage enum traits.

Bug: 732825
Change-Id: Idd41676f01a11f7666bf2c1c07621b4b9eae6b4a
Reviewed-on: https://chromium-review.googlesource.com/578211Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Xingyu Zhang <staraz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488316}

ui/gfx/mojo/buffer_types_struct_traits.h

@@ -111,6 +111,7 @@ struct EnumTraits<gfx::mojom::BufferFormat, gfx::BufferFormat> {
         return true;
       case gfx::mojom::BufferFormat::UYVY_422:
         *out = gfx::BufferFormat::UYVY_422;
+        return true;
     }
     NOTREACHED();
     return false;

ui/gfx/mojo/struct_traits_unittest.cc

@@ -7,6 +7,7 @@
 #include "base/message_loop/message_loop.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "ui/gfx/mojo/buffer_types_struct_traits.h"
 #include "ui/gfx/mojo/traits_test_service.mojom.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/selection_bound.h"
@@ -192,4 +193,28 @@ TEST_F(StructTraitsTest, NullGpuMemoryBufferHandle) {
   EXPECT_TRUE(output.is_null());
 }
 
+TEST_F(StructTraitsTest, BufferFormat) {
+  using BufferFormatTraits =
+      mojo::EnumTraits<gfx::mojom::BufferFormat, gfx::BufferFormat>;
+  BufferFormat output;
+  mojom::TraitsTestServicePtr proxy = GetTraitsTestProxy();
+  for (int i = 0; i <= static_cast<int>(BufferFormat::LAST); ++i) {
+    BufferFormat input = static_cast<BufferFormat>(i);
+    BufferFormatTraits::FromMojom(BufferFormatTraits::ToMojom(input), &output);
+    EXPECT_EQ(output, input);
+  }
+}
+
+TEST_F(StructTraitsTest, BufferUsage) {
+  using BufferUsageTraits =
+      mojo::EnumTraits<gfx::mojom::BufferUsage, gfx::BufferUsage>;
+  BufferUsage output;
+  mojom::TraitsTestServicePtr proxy = GetTraitsTestProxy();
+  for (int i = 0; i <= static_cast<int>(BufferUsage::LAST); ++i) {
+    BufferUsage input = static_cast<BufferUsage>(i);
+    BufferUsageTraits::FromMojom(BufferUsageTraits::ToMojom(input), &output);
+    EXPECT_EQ(output, input);
+  }
+}
+
 }  // namespace gfx