Fix documentation for Measure and MeasureAs IDL extended attributes.

third_party/WebKit/Source/bindings/IDLExtendedAttributes.md

 # Blink IDL Extended Attributes
 
 [TOC]
 
 ## Introduction
 
 The main interest in extended attributes are their _semantics_: Blink implements many more extended attributes than the Web IDL standard, to specify various behavior.
 
 The authoritative list of allowed extended attributes and values is [bindings/IDLExtendedAttributes.txt](https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/bindings/IDLExtendedAttributes.txt). This is complete but not necessarily precise (there may be unused extended attributes or values), since validation is run on build, but coverage isn't checked.
 
@@ skipping 965 matching lines @@
 }
 for (var value of iter) {
     // Same as above.
 }
 ```
 
 *** note
 Currently the code generator doesn't take care of the name conflict. Namely, it is not allowed to have "iterator" method in an iterable interface.
 ***
 
-### [Measure] _(m, a, c)_
+### [Measure] _(i, m, a, c)_
 
 Summary: Measures usage of a specific feature via UseCounter.
 
 In order to measure usage of specific features, Chrome submits anonymous statistics through the Histogram recording system for users who opt-in to sharing usage statistics. This extended attribute hooks up a specific feature to this measurement system.
 
-Usage: `[Measure]` can be specified on methods, attributes, and constants. The generated feature name must be added to [UseCounter::Feature](https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/core/frame/UseCounter.h&q=%22enum%20Feature%22&sq=package:chromium&type=cs&l=61) (in [core/frame/UseCounter.h](https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/core/frame/UseCounter.h)).
+Usage: `[Measure]` can be specified on interfaces, methods, attributes, and constants. When specified on an interface usage of the constructor will be measured. The generated feature name must be added to [UseCounter::Feature](https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/core/frame/UseCounter.h&q=%22enum%20Feature%22&sq=package:chromium&type=cs&l=61) (in [core/frame/UseCounter.h](https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/core/frame/UseCounter.h)).
 
 ```webidl
 [Measure] attribute Node interestingAttribute;
 [Measure] Node getInterestingNode();
 [Measure] const INTERESTING_CONSTANT = 1;
 ```
 
-### [MeasureAs] _(m, a, c)_
+### [MeasureAs] _(i, m, a, c)_
 
 Summary: Like `[Measure]`, but the feature name is provided as the extended attribute value.
 This is similar to the standard `[DeprecateAs]` extended attribute, but does not display a deprecation warning.
 
-Usage: `[MeasureAs]` can be specified on methods, attributes, and constants. The value must match one of the enumeration values in [UseCounter::Feature](https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/core/frame/UseCounter.h&q=%22enum%20Feature%22&sq=package:chromium&type=cs&l=61) (in [core/frame/UseCounter.h](https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/core/frame/UseCounter.h)).
+Usage: `[MeasureAs]` can be specified on interfaces, methods, attributes, and constants. The value must match one of the enumeration values in [UseCounter::Feature](https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/core/frame/UseCounter.h&q=%22enum%20Feature%22&sq=package:chromium&type=cs&l=61) (in [core/frame/UseCounter.h](https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/core/frame/UseCounter.h)).
 
 ```webidl
 [MeasureAs=AttributeWeAreInterestedIn] attribute Node interestingAttribute;
 [MeasureAs=MethodsAreInterestingToo] Node getInterestingNode();
 [MeasureAs=EvenSomeConstantsAreInteresting] const INTERESTING_CONSTANT = 1;
 ```
 
 ### [NotEnumerable] _(m, a, s)_
 
 *** note
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 Copyright (C) 2009 Apple Inc. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 
 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 
 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
 
 THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ***