Use base::saturated_cast to convert floating-point sampler parameter to int.

Allow direct use of base/numerics/safe_conversions.h in Blink.

Bug: 854710
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I43c664317beca77525fe65445a25da528c7747d5
Reviewed-on: https://chromium-review.googlesource.com/1109267
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569716}

third_party/blink/renderer/DEPS

@@ -13,6 +13,7 @@ include_rules = [
     "+base/memory/weak_ptr.h",
     "+base/metrics/histogram_macros.h",
     "+base/numerics/checked_math.h",
+    "+base/numerics/safe_conversions.h",
     "+base/optional.h",
     "+base/rand_util.h",
     "+base/sequenced_task_runner.h",

third_party/blink/renderer/modules/webgl/webgl2_rendering_context_base.cc

@@ -6,6 +6,7 @@
 
 #include <memory>
 #include "base/numerics/checked_math.h"
+#include "base/numerics/safe_conversions.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "third_party/blink/public/platform/web_graphics_context_3d_provider.h"
 #include "third_party/blink/renderer/bindings/modules/v8/webgl_any.h"
@@ -4061,7 +4062,12 @@ void WebGL2RenderingContextBase::SamplerParameter(WebGLSampler* sampler,
   if (isContextLost() || !ValidateWebGLObject("samplerParameter", sampler))
     return;
 
-  GLint param = is_float ? static_cast<GLint>(paramf) : parami;
+  GLint param;
+  if (is_float) {
+    param = base::saturated_cast<GLint>(paramf);
+  } else {
+    param = parami;
+  }
   switch (pname) {
     case GL_TEXTURE_MAX_LOD:
     case GL_TEXTURE_MIN_LOD:

third_party/blink/tools/audit_non_blink_usage.py

@@ -75,6 +75,19 @@ _CONFIG = [
             # //base/memory/ptr_util.h.
             'base::WrapUnique',
 
+            # //base/numerics/safe_conversions.h.
+            'base::as_signed',
+            'base::as_unsigned',
+            'base::checked_cast',
+            'base::strict_cast',
+            'base::saturated_cast',
+            'base::SafeUnsignedAbs',
+            'base::StrictNumeric',
+            'base::MakeStrictNum',
+            'base::IsValueInRangeForNumericType',
+            'base::IsTypeInRangeForNumericType',
+            'base::IsValueNegative',
+
             # //base/synchronization/waitable_event.h.
             'base::WaitableEvent',