Extract shared filters and aliasing code

appengine/swarming/elements/res/imp/botlist/DESIGN.md

Index: appengine/swarming/elements/res/imp/botlist/DESIGN.md
diff --git a/appengine/swarming/elements/res/imp/botlist/DESIGN.md b/appengine/swarming/elements/res/imp/botlist/DESIGN.md
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index 0000000000000000000000000000000000000000..f6f6dcedc73e522f5c2fd2386ee9d3bad090b755
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+This is a highlevel overview of the pieces that make up botlist.

[jcgregorio, 2016/08/24 14:48:27]

Move this up from /res/imp/botlist to /res/imp since the behaviors are used
across more than just the botlist elements. 

The diagram doesn't need to change, just add a note that this is an example
ofhow the behaviors are used by <bot-list>.

[kjlubick, 2016/08/24 15:06:32]

Done.

+
+```
+                        +----------------+
+                        |                |
+         +------------->+ CommonBehavior +<-----------------+
+         |              |                |                  |
+         |              +------+---------+                  |
+         |                     ^                            |
+         |                     |                            |
+         |                     |                            |
+         |                     |                            |
++--------+----------+     +----+------------+       +-------+--------------+
+|                   |     |                 |       |                      |
+| QueryColumnFilter |     | BotListBehavior |       | DynamicTableBehavior |
+|                   |     |                 |       |                      |
++-------------------+     +-----------------+       +----------------------+
+         ^  +-------------^ ^      ^ ^-------------------+     ^
+         |  |               |      |                     |     |
+         |  |               |      +---+                 |     |
+         |  |               |          |                 |     |
+    +----+--+-------+       |    +-----+--------------+  +-----+------+
+    |               |       |    |                    |  |            |
+    | <bot-filters> |       |    | <bot-list-summary> |  | <bot-list> |
+    |               |       |    |                    |  |            |
+    +---------------+       |    +--------------------+  +------------+
+                            |     +-----------------+
+                            |     |                 |
+                            +-----+ <bot-list-data> |
+                                  |                 |
+                                  +-----------------+
+```
+
+Although methods defined in the various behaviors could be overwritten by each
+other, this is not done.
+
+`<bot-list>` is the main element and composes the others.