Adjust sizes of material design shadows based on Sebastien's feedback.

ui/views/controls/button/md_text_button.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/controls/button/md_text_button.h"
 
 #include "base/i18n/case_conversion.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/color_utils.h"
@@ skipping 162 matching lines @@
 }
 
 std::unique_ptr<views::InkDropHighlight> MdTextButton::CreateInkDropHighlight()
     const {
   if (!ShouldShowInkDropHighlight())
     return nullptr;
   if (!is_cta_)
     return LabelButton::CreateInkDropHighlight();
 
   // The call to action hover effect is a shadow.
-  const int kYOffset = 2;
-  const int kSkiaBlurRadius = 2;
+  const int kYOffset = 1;
+  const int kSkiaBlurRadius = 1;
   std::vector<gfx::ShadowValue> shadows;
-  // The notion of blur that gfx::ShadowValue uses is twice the skia value,
-  // which is a number of pixels outside of the shadowed area.
+  // The notion of blur that gfx::ShadowValue uses is twice the Skia/CSS value.
+  // Skia counts the number of pixels outside the mask area whereas
+  // gfx::ShadowValue counts together the number of pixels inside and outside
+  // the mask bounds.
   shadows.push_back(gfx::ShadowValue(gfx::Vector2d(0, kYOffset),
                                      2 * kSkiaBlurRadius,
                                      SkColorSetA(SK_ColorBLACK, 0x3D)));
   return base::WrapUnique(new InkDropHighlight(
       GetLocalBounds().CenterPoint(),
       base::WrapUnique(new BorderShadowLayerDelegate(
           shadows, GetLocalBounds(), kInkDropSmallCornerRadius))));
 }
 
 bool MdTextButton::ShouldShowInkDropForFocus() const {
@@ skipping 73 matching lines @@
   SkColor stroke_color = (is_cta_ || color_utils::IsDark(text_color))
                              ? SkColorSetA(SK_ColorBLACK, kStrokeOpacity)
                              : SkColorSetA(SK_ColorWHITE, 2 * kStrokeOpacity);
 
   set_background(Background::CreateBackgroundPainter(
       true, Painter::CreateRoundRectWith1PxBorderPainter(
                 bg_color, stroke_color, kInkDropSmallCornerRadius)));
 }
 
 }  // namespace views