use cmath functions instead of math.h for consistency

std::isnan seems to be used a lot more in the tree and other cmath
functions are used in base_rendering_context_2d.cc, so let's use
std::isnan here too.  This has a side benefit of working on some
older toolchains that don't like to mix math.h and cmath.

While we're at it, include the required header files for other
standard library types.

Change-Id: I61c9333c984dd1332f1f18ce21550474a193275c
Reviewed-on: https://chromium-review.googlesource.com/c/1301440Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Commit-Queue: Mostyn Bramley-Moore <mostynb@vewd.com>
Cr-Commit-Position: refs/heads/master@{#603093}

third_party/blink/renderer/modules/canvas/canvas2d/base_rendering_context_2d.cc

@@ -4,6 +4,10 @@
 
 #include "third_party/blink/renderer/modules/canvas/canvas2d/base_rendering_context_2d.h"
 
+#include <algorithm>
+#include <cmath>
+#include <memory>
+
 #include "base/numerics/checked_math.h"
 #include "third_party/blink/renderer/core/css/cssom/css_url_image_value.h"
 #include "third_party/blink/renderer/core/css/parser/css_parser.h"
@@ -650,8 +654,8 @@ void BaseRenderingContext2D::DrawPathInternal(
 
   SkPath sk_path = path.GetSkPath();
   FloatRect bounds = path.BoundingRect();
-  if (isnan(bounds.X()) || isnan(bounds.Y()) || isnan(bounds.Width()) ||
-      isnan(bounds.Height()))
+  if (std::isnan(bounds.X()) || std::isnan(bounds.Y()) ||
+      std::isnan(bounds.Width()) || std::isnan(bounds.Height()))
     return;
   sk_path.setFillType(fill_type);
 

third_party/blink/renderer/modules/canvas/canvas2d/base_rendering_context_2d.h

@@ -5,6 +5,8 @@
 #ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_CANVAS_CANVAS2D_BASE_RENDERING_CONTEXT_2D_H_
 #define THIRD_PARTY_BLINK_RENDERER_MODULES_CANVAS_CANVAS2D_BASE_RENDERING_CONTEXT_2D_H_
 
+#include <utility>
+
 #include "third_party/blink/renderer/bindings/modules/v8/canvas_image_source.h"
 #include "third_party/blink/renderer/bindings/modules/v8/string_or_canvas_gradient_or_canvas_pattern.h"
 #include "third_party/blink/renderer/core/geometry/dom_matrix.h"