[css-flex] Implement the space-evenly content-distribution value

third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp

Index: third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp b/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
index ae3f5d5196e7e557e76a443cab7ebb0c62449414..be528ccafe4b3eec5c309aad7105d53f62f765ed 100644
--- a/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
@@ -1516,6 +1516,12 @@ static LayoutUnit InitialJustifyContentOffset(
 
     return available_free_space / 2;
   }
+  if (justify_content_distribution == kContentDistributionSpaceEvenly) {
+    if (available_free_space > 0 && number_of_children)
+      return available_free_space / (number_of_children + 1);
+    // Fallback to 'center'

[Manuel Rego, 2017/04/20 08:57:06]

Supernit: End comment with dot.

+    return available_free_space / 2;
+  }
   return LayoutUnit();
 }
 
@@ -1528,6 +1534,8 @@ static LayoutUnit JustifyContentSpaceBetweenChildren(
       return available_free_space / (number_of_children - 1);
     if (justify_content_distribution == kContentDistributionSpaceAround)
       return available_free_space / number_of_children;
+    if (justify_content_distribution == kContentDistributionSpaceEvenly)
+      return available_free_space / (number_of_children + 1);
   }
   return LayoutUnit();
 }
@@ -1965,6 +1973,12 @@ static LayoutUnit InitialAlignContentOffset(
     if (available_free_space < 0)
       return available_free_space / 2;
   }
+  if (align_content_distribution == kContentDistributionSpaceEvenly) {
+    if (available_free_space > 0)
+      return available_free_space / (number_of_lines + 1);
+    // Fallback to 'center'

[Manuel Rego, 2017/04/20 08:57:06]

Ditto.

+    return available_free_space / 2;
+  }
   return LayoutUnit();
 }
 
@@ -1978,6 +1992,8 @@ static LayoutUnit AlignContentSpaceBetweenChildren(
     if (align_content_distribution == kContentDistributionSpaceAround ||
         align_content_distribution == kContentDistributionStretch)
       return available_free_space / number_of_lines;
+    if (align_content_distribution == kContentDistributionSpaceEvenly)
+      return available_free_space / (number_of_lines + 1);
   }
   return LayoutUnit();
 }