Adding static type to the logic blocks.

blocks/logic.js

@@ -327,6 +327,13 @@ Blockly.Blocks['logic_compare'] = {
     }
     this.prevBlocks_[0] = blockA;
     this.prevBlocks_[1] = blockB;
+  },
+  /**
+   * Assigns a type to the block, comparison operations result in booleans.
+   * @this Blockly.Block
+   */
+  getType: function() {
+    return 'boolean';
   }
 };
 
@@ -358,6 +365,13 @@ Blockly.Blocks['logic_operation'] = {
       };
       return TOOLTIPS[op];
     });
+  },
+  /**
+   * Assigns a type to the block, logic comparison operations result in bools.
+   * @this Blockly.Block
+   */
+  getType: function() {
+    return 'boolean';
   }
 };
 
@@ -374,6 +388,14 @@ Blockly.Blocks['logic_negate'] = {
                         ['BOOL', 'Boolean', Blockly.ALIGN_RIGHT],
                         Blockly.ALIGN_RIGHT);
     this.setTooltip(Blockly.Msg.LOGIC_NEGATE_TOOLTIP);
+  },
+  /**
+   * Assigns a type to the block, not input is meant to be a booleans, so it
+   * should return the same.
+   * @this Blockly.Block
+   */
+  getType: function() {
+    return 'boolean';
   }
 };
 
@@ -392,6 +414,13 @@ Blockly.Blocks['logic_boolean'] = {
     this.appendDummyInput()
         .appendField(new Blockly.FieldDropdown(BOOLEANS), 'BOOL');
     this.setTooltip(Blockly.Msg.LOGIC_BOOLEAN_TOOLTIP);
+  },
+  /**
+   * Assigns a type to the boolean block.
+   * @this Blockly.Block
+   */
+  getType: function() {
+    return 'boolean';
   }
 };
 
@@ -408,6 +437,7 @@ Blockly.Blocks['logic_null'] = {
         .appendField(Blockly.Msg.LOGIC_NULL);
     this.setTooltip(Blockly.Msg.LOGIC_NULL_TOOLTIP);
   }
+  // Null does not have a type, so no getType.
 };
 
 Blockly.Blocks['logic_ternary'] = {
@@ -428,4 +458,5 @@ Blockly.Blocks['logic_ternary'] = {
     this.setOutput(true);
     this.setTooltip(Blockly.Msg.LOGIC_TERNARY_TOOLTIP);
   }
+  //TODO: getType that uses the type of the given inputs
 };