Fixup runtime/arrays issue.

This CL converts a variable-length array into a std::array and enables
the runtime/arrays lint check.

Bug: dawn:1339
Change-Id: Ib71828dab84c1651655494108d9fd11922b84e81
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/86868
Auto-Submit: Dan Sinclair <dsinclair@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>

src/dawn/CPPLINT.cfg

@@ -4,7 +4,6 @@ filter=-build/namespaces
 filter=-readability/casting
 filter=-readability/namespace
 filter=-readability/todo
-filter=-runtime/arrays
 filter=-runtime/explicit
 filter=-runtime/indentation_namespace
 filter=-runtime/int

src/dawn/tests/end2end/SamplerTests.cpp

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include <array>
 #include <cmath>
 
 #include "dawn/tests/DawnTest.h"
@@ -97,12 +98,12 @@ class SamplerTest : public DawnTest {
 
         // Create a 2x2 checkerboard texture, with black in the top left and bottom right corners.
         const uint32_t rowPixels = kTextureBytesPerRowAlignment / sizeof(RGBA8);
-        RGBA8 data[rowPixels * 2];
-        data[0] = data[rowPixels + 1] = RGBA8::kBlack;
-        data[1] = data[rowPixels] = RGBA8::kWhite;
+        std::array<RGBA8, rowPixels * 2> pixels;
+        pixels[0] = pixels[rowPixels + 1] = RGBA8::kBlack;
+        pixels[1] = pixels[rowPixels] = RGBA8::kWhite;
 
-        wgpu::Buffer stagingBuffer =
-            utils::CreateBufferFromData(device, data, sizeof(data), wgpu::BufferUsage::CopySrc);
+        wgpu::Buffer stagingBuffer = utils::CreateBufferFromData(
+            device, pixels.data(), pixels.size() * sizeof(RGBA8), wgpu::BufferUsage::CopySrc);
         wgpu::ImageCopyBuffer imageCopyBuffer = utils::CreateImageCopyBuffer(stagingBuffer, 0, 256);
         wgpu::ImageCopyTexture imageCopyTexture =
             utils::CreateImageCopyTexture(texture, 0, {0, 0, 0});