XFA: Sync build and documentation differences with master

docs/build.md

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-# PDFium
-
-## Prerequisites
-
-Get the chromium depot tools via the instructions at
-http://www.chromium.org/developers/how-tos/install-depot-tools (this provides
-the gclient utilty needed below).
-
-Also install Python, Subversion, and Git and make sure they're in your path.
-
-## Get the code
-
-The name of the top-level directory does not matter. In our examples, we use
-"repo". This directory must not have been used before by `gclient config` as
-each directory can only house a single gclient configuration.
-
-```
-mkdir repo
-cd repo
-gclient config --unmanaged https://pdfium.googlesource.com/pdfium.git
-gclient sync
-cd pdfium
-```
-
-## Generate the build files
-
-We use the GYP library to generate the build files.
-
-At this point, you have two options. The first option is to use the [Ninja]
-(http://martine.github.io/ninja/) build system (also included with the
-depot\_tools checkout). This is the default as of mid-September, 2015.
-Previously, the second option (platform-specific build files) was the default.
-Most PDFium developers use Ninja, as does our [continuous build system]
-(http://build.chromium.org/p/client.pdfium/).
-
- * On Windows: `build\gyp\_pdfium`
- * For all other platforms: `build/gyp\_pdfium`
-
-The second option is to generate platform-specific build files, i.e. Makefiles
-on Linux, sln files on Windows, and xcodeproj files on Mac. To do so, set the
-GYP\_GENERATORS environment variable appropriately (e.g. "make", "msvs", or
-"xcode") before running the above command.
-
-## Building the code
-
-If you used Ninja, you can build the sample program by: `ninja -C out/Debug
-pdfium\_test` You can build the entire product (which includes a few unit
-tests) by: `ninja -C out/Debug`.
-
-If you're not using Ninja, then building is platform-specific.
-
- * On Linux: `make pdfium\_test`
- * On Mac: `open build/all.xcodeproj`
- * On Windows: open build\all.sln
-
-## Running the sample program
-
-The pdfium\_test program supports reading, parsing, and rasterizing the pages of
-a .pdf file to .ppm or .png output image files (windows supports two other
-formats). For example: `out/Debug/pdfium\_test --ppm path/to/myfile.pdf`. Note
-that this will write output images to `path/to/myfile.pdf.<n>.ppm`.
-
-## Testing
-
-There are currently several test suites that can be run:
-
- * pdfium\_unittests
- * pdfium\_embeddertests
- * testing/tools/run\_corpus\_tests.py
- * testing/tools/run\_javascript\_tests.py
- * testing/tools/run\_pixel\_tests.py
-
-It is possible the tests in the `testing` directory can fail due to font
-differences on the various platforms. These tests are reliable on the bots. If
-you see failures, it can be a good idea to run the tests on the tip-of-tree
-checkout to see if the same failures appear.
-
-## Waterfall
-
-The current health of the source tree can be found at
-http://build.chromium.org/p/client.pdfium/console
-
-## Community
-
-There are several mailing lists that are setup:
-
- * [PDFium](https://groups.google.com/forum/#!forum/pdfium)
- * [PDFium Reviews](https://groups.google.com/forum/#!forum/pdfium-reviews)
- * [PDFium Bugs](https://groups.google.com/forum/#!forum/pdfium-bugs)
-
-Note, the Reviews and Bugs lists are typically read-only.
-
-## Bugs
-
- We will be using this
-[bug tracker](https://code.google.com/p/pdfium/issues/list), but for security
-bugs, please use [Chromium's security bug template]
-(https://code.google.com/p/chromium/issues/entry?template=Security%20Bug)
-and add the "Cr-Internals-Plugins-PDF" label.
-
-## Contributing code
-
-For contributing code, we will follow
-[Chromium's process](http://dev.chromium.org/developers/contributing-code)
-as much as possible. The main exceptions are:
-
-1. Code has to conform to the existing style and not Chromium/Google style.
-2. There is no commit queue, approved committers can land their changes via
-`git cl land`
-3. Changes must be merged to the XFA branch as well (see below).
-
-## Branches
-
-There is a branch for a forthcoming feature called XFA that you can get by
-following the steps above, then:
-
-```
-git checkout origin/xfa
-build/gyp_pdfium
-ninja -C out/Debug
-```
-
-Merging to XFA requires:
-
-```
-git checkout origin/xfa
-git checkout -b merge_branch
-git branch --set-upstream-to=origin/xfa
-git cherry-pick -x <commit hash>
-git commit --amend # add Merge to XFA
-git cl upload
-```
-
-Then wait for approval, and `git cl land`