tint: Add a benchmark for atan2 const eval

And increase the test runner timeout from 30s to 2min.
FXC really doesn't like this shader, however I expect this to be
made much faster once constant evaluation for atan2 is implemented.

Change-Id: Id8a8ba97b5a99a2f94633a0732300a35ba6dc1c3
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/96401
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>

src/tint/bench/benchmark.h

@@ -58,6 +58,7 @@ std::variant<ProgramAndFile, Error> LoadProgram(std::string name);
 /// files in `<tint>/test/benchmark`.
 #define TINT_BENCHMARK_WGSL_PROGRAMS(FUNC)                                   \
     TINT_BENCHMARK_WGSL_PROGRAM(FUNC, "animometer.wgsl");                    \
+    TINT_BENCHMARK_WGSL_PROGRAM(FUNC, "atan2-const-eval.wgsl");              \
     TINT_BENCHMARK_WGSL_PROGRAM(FUNC, "bloom-vertical-blur.wgsl");           \
     TINT_BENCHMARK_WGSL_PROGRAM(FUNC, "cluster-lights.wgsl");                \
     TINT_BENCHMARK_WGSL_PROGRAM(FUNC, "empty.wgsl");                         \

tools/src/cmd/test-runner/main.go

@@ -39,7 +39,7 @@ import (
 type outputFormat string
 
 const (
-	testTimeout = 30 * time.Second
+	testTimeout = 2 * time.Minute
 
 	glsl   = outputFormat("glsl")
 	hlsl   = outputFormat("hlsl")