Use float equality check function from cc/base/math_util.h

In render_widget_host_view_android.cc FloatEquals() function is
implemented. This implementaion already exists in cc/base/math_util
as IsFloatNearlyTheSame(). So the FloatEquals() implementation is
removed and is replaced with IsFloatNearlyTheSame() in the calling
functions.

Bug: None
Change-Id: I84dd6fc29475e59cbbac6e953c8f0093f9f972c5
Reviewed-on: https://chromium-review.googlesource.com/1177218Reviewed-by: Eric Karl <ericrk@chromium.org>
Commit-Queue: Prashant Nevase <prashant.n@samsung.com>
Cr-Commit-Position: refs/heads/master@{#586195}

content/browser/renderer_host/render_widget_host_view_android.cc

@@ -21,6 +21,7 @@
 #include "base/strings/utf_string_conversions.h"
 #include "base/sys_info.h"
 #include "base/threading/thread_task_runner_handle.h"
+#include "cc/base/math_util.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/surface_layer.h"
 #include "cc/trees/latency_info_swap_promise.h"
@@ -148,10 +149,6 @@ void RecordToolTypeForActionDown(const ui::MotionEventAndroid& event) {
   }
 }
 
-bool FloatEquals(float a, float b) {
-  return std::abs(a - b) < FLT_EPSILON;
-}
-
 void WakeUpGpu(GpuProcessHost* host) {
   if (host && host->wake_up_gpu_before_drawing()) {
     host->gpu_service()->WakeUpGpu();
@@ -1344,7 +1341,8 @@ bool RenderWidgetHostViewAndroid::UpdateControls(
   float top_content_offset = top_controls_height * top_controls_shown_ratio;
   float top_shown_pix = top_content_offset * to_pix;
   float top_translate = top_shown_pix - top_controls_pix;
-  bool top_changed = !FloatEquals(top_shown_pix, prev_top_shown_pix_);
+  bool top_changed =
+      !cc::MathUtil::IsFloatNearlyTheSame(top_shown_pix, prev_top_shown_pix_);
   // TODO(mthiesse, https://crbug.com/853686): Remove the IsInVR check once
   // there are no use cases for ignoring the initial update.
   if (top_changed || (!controls_initialized_ && IsInVR()))
@@ -1354,7 +1352,8 @@ bool RenderWidgetHostViewAndroid::UpdateControls(
 
   float bottom_controls_pix = bottom_controls_height * to_pix;
   float bottom_shown_pix = bottom_controls_pix * bottom_controls_shown_ratio;
-  bool bottom_changed = !FloatEquals(bottom_shown_pix, prev_bottom_shown_pix_);
+  bool bottom_changed = !cc::MathUtil::IsFloatNearlyTheSame(
+      bottom_shown_pix, prev_bottom_shown_pix_);
   float bottom_translate = bottom_controls_pix - bottom_shown_pix;
   if (bottom_changed || (!controls_initialized_ && IsInVR()))
     view_.OnBottomControlsChanged(bottom_translate, bottom_shown_pix);