Add toDouble() helper, and use toFloat()/toDouble() for conversions

Add toDouble() helper, and use toFloat()/toDouble() for conversions

Like we do for all integer types, use helper functions from V8Binding.h
to convert from v8::Value to native types. These helper functions throw
all exceptions via their ExceptionState& argument, which means we don't
need to initialize a v8::TryCatch in the caller.

The helpers initialize a v8::TryCatch if they call in to V8 to convert
a value, but they do not do this if the value is already of the correct
type.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181812

[Jens Widell, 2014-09-11 09:40:53]

jl@opera.com changed reviewers:
+ haraken@chromium.org

[Jens Widell, 2014-09-11 09:40:54]

PTAL

https://codereview.chromium.org/567503002/diff/1/Source/bindings/templates/in...
File Source/bindings/templates/interface.cpp (right):

https://codereview.chromium.org/567503002/diff/1/Source/bindings/templates/in...
Source/bindings/templates/interface.cpp:284: {% if setter.has_exception_state %}
Moved this since otherwise the |exceptionState| local was declared after it was
used for argument conversion.

[haraken, 2014-09-11 11:55:29]

LGTM

[Jens Widell, 2014-09-11 11:56:10]

The CQ bit was checked by jl@opera.com

[commit-bot: I haz the power, 2014-09-11 11:56:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/567503002/1

[commit-bot: I haz the power, 2014-09-11 12:00:39]

Committed patchset #1 (id:1) as 181812