Update WM shadows for MD.

ui/gfx/shadow_value.cc

Index: ui/gfx/shadow_value.cc
diff --git a/ui/gfx/shadow_value.cc b/ui/gfx/shadow_value.cc
index 2599fdbe446cd4089540533ed7477f4170190a0a..a8ab3f894366b49aab025aa317397c28a2aa2736 100644
--- a/ui/gfx/shadow_value.cc
+++ b/ui/gfx/shadow_value.cc
@@ -14,19 +14,43 @@
 
 namespace gfx {
 
-ShadowValue::ShadowValue()
-    : blur_(0),
-      color_(0) {
+namespace {
+
+Insets GetInsets(const ShadowValues& shadows, bool include_inner_blur) {
+  int left = 0;
+  int top = 0;
+  int right = 0;
+  int bottom = 0;
+
+  for (size_t i = 0; i < shadows.size(); ++i) {
+    const ShadowValue& shadow = shadows[i];
+
+    double blur = shadow.blur();
+    if (!include_inner_blur)
+      blur /= 2;
+    // Add 0.5 to round up to the next integer.
+    int blur_length = static_cast<int>(blur + 0.5);
+
+    left = std::max(left, blur_length - shadow.x());
+    top = std::max(top, blur_length - shadow.y());
+    right = std::max(right, blur_length + shadow.x());
+    bottom = std::max(bottom, blur_length + shadow.y());
+  }
+
+  return Insets(top, left, bottom, right);
 }
 
+}  // namespace
+
+ShadowValue::ShadowValue() : blur_(0), color_(0) {}
+
 ShadowValue::ShadowValue(const gfx::Vector2d& offset,
                          double blur,
                          SkColor color)
     : offset_(offset), blur_(blur), color_(color) {
 }
 
-ShadowValue::~ShadowValue() {
-}
+ShadowValue::~ShadowValue() {}
 
 ShadowValue ShadowValue::Scale(float scale) const {
   gfx::Vector2d scaled_offset =
@@ -47,24 +71,13 @@ std::string ShadowValue::ToString() const {
 
 // static
 Insets ShadowValue::GetMargin(const ShadowValues& shadows) {
-  int left = 0;
-  int top = 0;
-  int right = 0;
-  int bottom = 0;
-
-  for (size_t i = 0; i < shadows.size(); ++i) {
-    const ShadowValue& shadow = shadows[i];
-
-    // Add 0.5 to round up to the next integer.
-    int blur = static_cast<int>(shadow.blur() / 2 + 0.5);
-
-    left = std::max(left, blur - shadow.x());
-    top = std::max(top, blur - shadow.y());
-    right = std::max(right, blur + shadow.x());
-    bottom = std::max(bottom, blur + shadow.y());
-  }
+  gfx::Insets margins = GetInsets(shadows, false);
+  return -margins;
+}
 
-  return Insets(-top, -left, -bottom, -right);
+// static
+Insets ShadowValue::GetBlurRegion(const ShadowValues& shadows) {
+  return GetInsets(shadows, true);
 }
 
 }  // namespace gfx