tint->dawn: Shuffle source tree in preperation of merging repos

docs/    -> docs/tint/
fuzzers/ -> src/tint/fuzzers/
samples/ -> src/tint/cmd/
src/     -> src/tint/
test/    -> test/tint/

BUG=tint:1418,tint:1433

Change-Id: Id2aa79f989aef3245b80ef4aa37a27ff16cd700b
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/80482
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>

test/tint/buffer/storage/dynamic_index/write.wgsl.expected.glsl

@@ -0,0 +1,35 @@
+#version 310 es
+
+struct Inner {
+  ivec3 a;
+  int b;
+  uvec3 c;
+  uint d;
+  vec3 e;
+  float f;
+  mat2x3 g;
+  mat3x2 h;
+  ivec4 i[4];
+};
+
+layout(binding = 0, std430) buffer S_1 {
+  Inner arr[];
+} s;
+void tint_symbol(uint idx) {
+  s.arr[idx].a = ivec3(0, 0, 0);
+  s.arr[idx].b = 0;
+  s.arr[idx].c = uvec3(0u, 0u, 0u);
+  s.arr[idx].d = 0u;
+  s.arr[idx].e = vec3(0.0f, 0.0f, 0.0f);
+  s.arr[idx].f = 0.0f;
+  s.arr[idx].g = mat2x3(0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f);
+  s.arr[idx].h = mat3x2(0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f);
+  ivec4 tint_symbol_1[4] = ivec4[4](ivec4(0, 0, 0, 0), ivec4(0, 0, 0, 0), ivec4(0, 0, 0, 0), ivec4(0, 0, 0, 0));
+  s.arr[idx].i = tint_symbol_1;
+}
+
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+void main() {
+  tint_symbol(gl_LocalInvocationIndex);
+  return;
+}