Add docs on C++11 in Eclipse

docs/linux_eclipse_dev.md

 # Linux Eclipse Dev
 
 Eclipse can be used on Linux (and probably Windows and Mac) as an IDE for
 developing Chromium. It's unpolished, but here's what works:
 
 *   Editing code works well (especially if you're used to it or Visual Studio).
 *   Navigating around the code works well. There are multiple ways to do this
     (F3, control-click, outlines).
 *   Building works fairly well and it does a decent job of parsing errors so
     that you can click and jump to the problem spot.
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 First, turn off automatic workspace refresh and automatic building, as Eclipse
 tries to do these too often and gets confused:
 
 1.  Open Window > Preferences
 1.  Search for "workspace"
 1.  Turn off "Build automatically"
 1.  Turn off "Refresh using native hooks or polling"
 1.  Click "Apply"
 
+Chromium uses C++11, so tell the indexer about it. Otherwise it will get
+confused about things like std::unique_ptr.
+
+1.  Open Window > Preferences > C/C++ > Build > Settings > Discovery >
+    CDT GCC Build-in Compiler Settings
+1.  In the text box entitled Command to get compiler specs append "-std=c++11"
+
 Create a single Eclipse project for everything:
 
 1.  From the File menu, select New > Project...
 1.  Select C/C++ Project > Makefile Project with Existing Code
 1.  Name the project the exact name of the directory: "src"
 1.  Provide a path to the code, like /work/chromium/src
 1.  Select toolchain: Linux GCC
 1.  Click Finish.
 
 Chromium has a huge amount of code, enough that Eclipse can take a very long
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 ### Additional tips
 
 1.  Mozilla's
     [Eclipse CDT guide](https://developer.mozilla.org/en-US/docs/Eclipse_CDT)
     is helpful:
 1.  For improved performance, I use medium-granularity projects (eg. one for
     WebKit/Source) instead of putting all of 'src/' in one project.
 1.  For working in Blink (which uses WebKit code style), feel free to use
     [this](https://drive.google.com/file/d/0B2LVVIKSxUVYM3R6U0tUa1dmY0U/view?usp=sharing)
     code-style formatter XML profile