DebugVisualizers: Add HashTable and Font-related classes

tools/win/DebugVisualizers/webkit.natvis

 <?xml version="1.0" encoding="utf-8" ?>
 <AutoVisualizer
     xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
   <Type Name="blink::Member&lt;*&gt;">
     <DisplayString Condition="m_raw == 0">null</DisplayString>
     <DisplayString>{*m_raw}</DisplayString>
     <Expand>
       <Item Name="m_raw">m_raw</Item>
     </Expand>
   </Type>
@@ skipping 34 matching lines @@
     <Expand>
       <Item Name="Buffer">m_buffer</Item>
       <Item Name="Size">m_size</Item>
       <Item Name="Capacity">m_capacity</Item>
       <ArrayItems Condition="m_size>0">
         <Size>m_size</Size>
         <ValuePointer>m_buffer</ValuePointer>
       </ArrayItems>
     </Expand>
   </Type>
+  <Type Name="WTF::HashTable&lt;*&gt;">
+    <DisplayString>keyCount={m_keyCount}, tableSize={m_tableSize}</DisplayString>
+    <Expand>
+      <ArrayItems Condition="m_tableSize>0">
+        <Size>m_tableSize</Size>
+        <ValuePointer>m_table</ValuePointer>
+      </ArrayItems>
+    </Expand>
+  </Type>
   <Type Name="WTF::RefPtr&lt;*&gt;">
     <AlternativeType Name="WTF::PassRefPtr&lt;*&gt;"/>
     <DisplayString Condition="m_ptr == 0">null</DisplayString>
     <DisplayString>{*m_ptr}</DisplayString>
     <Expand>
       <Item Name="Ptr">m_ptr</Item>
     </Expand>
   </Type>
   <Type Name="blink::LayoutUnit">
     <DisplayString>{(float)m_value / kFixedPointDenominator}</DisplayString>
@@ skipping 130 matching lines @@
   </Type>
   <!-- Layout: TextRun -->
   <Type Name="blink::TextRun">
     <DisplayString Condition="m_is8Bit">{m_data.characters8,[m_len]s}</DisplayString>
     <DisplayString>{(m_data.characters16),[m_len]su}</DisplayString>
   </Type>
   <Type Name="blink::BidiRun">
     <DisplayString>{*m_object} {m_start}-{m_stop}</DisplayString>
   </Type>
   <!-- Fonts -->
+  <Type Name="blink::Font">
+    <DisplayString>{m_fontDescription}</DisplayString>
+  </Type>
+  <Type Name="blink::FontDescription">
+    <DisplayString>{m_computedSize}px {m_familyList}</DisplayString>
+  </Type>
+  <Type Name="blink::FontFamily">
+    <DisplayString Condition="m_next.m_ptr == 0">{m_family,view(bare)}</DisplayString>
+    <DisplayString>{m_family,view(bare)}, {m_next}</DisplayString>
+  </Type>
+  <Type Name="blink::SharedFontFamily">
+    <DisplayString Condition="m_next.m_ptr == 0">{m_family,view(bare)}</DisplayString>
+    <DisplayString>{m_family,view(bare)}, {m_next}</DisplayString>
+    <Expand>
+      <LinkedListItems>
+        <HeadPointer>this</HeadPointer>
+        <NextPointer>m_next.m_ptr</NextPointer>
+        <ValueNode>this</ValueNode>
+      </LinkedListItems>
+    </Expand>
+  </Type>
   <Type Name="blink::SimpleFontData">
     <DisplayString>{m_platformData}</DisplayString>
   </Type>
   <Type Name="blink::FontPlatformData">
     <DisplayString>{*m_typeface.m_ptr}, {m_textSize}px</DisplayString>
   </Type>
 </AutoVisualizer>