Make the standalone msvs_disabled_warnings block match Chromium's.

build/standalone.gypi

Index: build/standalone.gypi
diff --git a/build/standalone.gypi b/build/standalone.gypi
index d8c1e4789408dc443d63216b611753ef2da2bca4..00bbd4f23566606a53dc42102dede5b74e3ef5ae 100644
--- a/build/standalone.gypi
+++ b/build/standalone.gypi
@@ -190,12 +190,99 @@
       'IntermediateDirectory': '$(OutDir)\\obj\\$(ProjectName)',
       'CharacterSet': '1',
     },
-    'msvs_disabled_warnings': [4800, 4996, 4456, 4457, 4458, 4459, 4091],
-    # 4456, 4457, 4458, 4459 are variable shadowing warnings that are new in
-    # VS2015.
-    # C4091: 'typedef ': ignored on left of 'X' when no variable is
-    #                    declared.
-    # This happens in a number of Windows headers with VS 2015.
+    'msvs_disabled_warnings': [
+      # ####
+      # This section is PDFium specific.
+      # ####
+
+      # C4800: forcing value to bool 'true' or 'false' (performance warning)
+      4800,
+
+      # ####
+      # This section should match Chromium's build/common.gypi.
+      # ####
+
+      # C4091: 'typedef ': ignored on left of 'X' when no variable is
+      #                    declared.
+      # This happens in a number of Windows headers. Dumb.
+      4091,
+
+      # C4127: conditional expression is constant
+      # This warning can in theory catch dead code and other problems, but
+      # triggers in far too many desirable cases where the conditional
+      # expression is either set by macros or corresponds some legitimate
+      # compile-time constant expression (due to constant template args,
+      # conditionals comparing the sizes of different types, etc.).  Some of
+      # these can be worked around, but it's not worth it.
+      4127,
+
+      # C4351: new behavior: elements of array 'array' will be default
+      #        initialized
+      # This is a silly "warning" that basically just alerts you that the
+      # compiler is going to actually follow the language spec like it's
+      # supposed to, instead of not following it like old buggy versions
+      # did.  There's absolutely no reason to turn this on.
+      4351,
+
+      # C4355: 'this': used in base member initializer list
+      # It's commonly useful to pass |this| to objects in a class'
+      # initializer list.  While this warning can catch real bugs, most of
+      # the time the constructors in question don't attempt to call methods
+      # on the passed-in pointer (until later), and annotating every legit
+      # usage of this is simply more hassle than the warning is worth.
+      4355,
+
+      # C4503: 'identifier': decorated name length exceeded, name was
+      #        truncated
+      # This only means that some long error messages might have truncated
+      # identifiers in the presence of lots of templates.  It has no effect
+      # on program correctness and there's no real reason to waste time
+      # trying to prevent it.
+      4503,
+
+      # Warning C4589 says: "Constructor of abstract class ignores
+      # initializer for virtual base class." Disable this warning because it
+      # is flaky in VS 2015 RTM. It triggers on compiler generated
+      # copy-constructors in some cases.
+      4589,
+
+      # C4611: interaction between 'function' and C++ object destruction is
+      #        non-portable
+      # This warning is unavoidable when using e.g. setjmp/longjmp.  MSDN
+      # suggests using exceptions instead of setjmp/longjmp for C++, but
+      # Chromium code compiles without exception support.  We therefore have
+      # to use setjmp/longjmp for e.g. JPEG decode error handling, which
+      # means we have to turn off this warning (and be careful about how
+      # object destruction happens in such cases).
+      4611,
+
+      # TODO(thestig): These warnings are level 4. They will be slowly
+      # removed as code is fixed.
+      4100, # Unreferenced formal parameter
+      4121, # Alignment of a member was sensitive to packing
+      4244, # Conversion from 'type1' to 'type2', possible loss of data
+      4481, # Nonstandard extension used: override specifier 'keyword'

[Nico, 2015/12/24 12:00:43]

this one hopefully doesn't fire anymore in vs2013?

[Lei Zhang, 2015/12/24 18:33:38]

I don't think so, but I'm just syncing this with Chromium's copy. Do you want to
try removing it there?

+      4505, # Unreferenced local function has been removed
+      4510, # Default constructor could not be generated
+      4512, # Assignment operator could not be generated
+      4610, # Object can never be instantiated
+      4838, # Narrowing conversion. Doesn't seem to be very useful.
+      4995, # 'X': name was marked as #pragma deprecated
+      4996, # 'X': was declared deprecated (for GetVersionEx).
+
+      # These are variable shadowing warnings that are new in VS2015. We
+      # should work through these at some point -- they may be removed from
+      # the RTM release in the /W4 set.
+      4456, 4457, 4458, 4459,
+
+      # TODO(brucedawson): http://crbug.com/554200 4312 is a VS
+      # 2015 64-bit warning for integer to larger pointer
+      4312,
+
+      # ####
+      # Do not add PDFium specific entries here. Add them to the top.
+      # ####
+    ],
     'msvs_settings': {
       'VCCLCompilerTool': {
         'MinimalRebuild': 'false',