Update the design of Unread Count

BUG: 2065601

* Show Unread Count of Accounts in AccountFolderList
* Change the background according to the folder's type
* Change the style of unread counts

TODO: Change background images of Unread Count
diff --git a/res/drawable/ind_sum.9.png b/res/drawable/ind_sum.9.png
new file mode 100644
index 0000000..9f820c5
--- /dev/null
+++ b/res/drawable/ind_sum.9.png
Binary files differ
diff --git a/res/drawable/ind_unread.9.png b/res/drawable/ind_unread.9.png
new file mode 100644
index 0000000..0012079
--- /dev/null
+++ b/res/drawable/ind_unread.9.png
Binary files differ
diff --git a/res/drawable/section_dark.9.png b/res/drawable/section_dark.9.png
new file mode 100644
index 0000000..7242b61
--- /dev/null
+++ b/res/drawable/section_dark.9.png
Binary files differ
diff --git a/res/drawable/section_light.9.png b/res/drawable/section_light.9.png
new file mode 100644
index 0000000..fcd9e2d
--- /dev/null
+++ b/res/drawable/section_light.9.png
Binary files differ