Implement SkAshmemDiscardableMemory

-   Implement ashmem-backed SkDiscardableMemory subclass:
    This class in only accesible via the SkDiscardableMemory::Create()
    function, which replaces the mock implementation in
    SkDiscardableMemory_none.cpp

-   Added SkDiscardableMemory_ashmem.cpp to the Android port of Skia
    Removed SkDiscardableMemory_none.cpp from the Android port.

-   Added DiscardableMemoryTest.
    Still needs work.

-   SkDiscardablePixelRef Bugfix:
    onLockPixels() now calls SkDELETE on the SkDiscardableMemory pointer
    when it fails to unlock.

-   Improved documentation inside ashmem.h

BUG=
R=scroggo@google.com

Review URL: https://codereview.chromium.org/83563002

git-svn-id: http://skia.googlecode.com/svn/trunk/gyp@12608 2bbb7eff-a529-9590-31e7-b0007b416f81

2 files changed, 3 insertions, 0 deletions

diff --git a/ports.gyp b/ports.gyp
index 068d2e1..26003de 100644
--- a/ports.gyp
+++ b/ports.gyp
@@ -153,10 +153,12 @@
         [ 'skia_os == "android"', {
           'sources!': [
             '../src/ports/SkDebug_stdio.cpp',
+            '../src/ports/SkDiscardableMemory_none.cpp',
             '../src/ports/SkPurgeableMemoryBlock_none.cpp',
           ],
           'sources': [
             '../src/ports/SkDebug_android.cpp',
+            '../src/ports/SkDiscardableMemory_ashmem.cpp',
             '../src/ports/SkFontConfigInterface_android.cpp',
             '../src/ports/SkFontConfigParser_android.cpp',
             '../src/ports/SkFontHost_fontconfig.cpp',
diff --git a/tests.gyp b/tests.gyp
index ed1d077..4c8053e 100644
--- a/tests.gyp
+++ b/tests.gyp
@@ -56,6 +56,7 @@
         '../tests/DequeTest.cpp',
         '../tests/DeviceLooperTest.cpp',
         '../tests/DiscardableMemoryPool.cpp',
+        '../tests/DiscardableMemoryTest.cpp',
         '../tests/DocumentTest.cpp',
         '../tests/DrawBitmapRectTest.cpp',
         '../tests/DrawPathTest.cpp',