Add suppressions for DrMemory PluginPowerSaverBrowserTest handle leaks.

tools/valgrind/drmemory/suppressions_full.txt

Index: tools/valgrind/drmemory/suppressions_full.txt
diff --git a/tools/valgrind/drmemory/suppressions_full.txt b/tools/valgrind/drmemory/suppressions_full.txt
index b48c19946bf6cc086fab9a0d85968d62affcab74..fd4ae6a392cc3cfa3d9c2a950fe8c9a60fcc766f 100644
--- a/tools/valgrind/drmemory/suppressions_full.txt
+++ b/tools/valgrind/drmemory/suppressions_full.txt
@@ -1949,3 +1949,31 @@ content.dll!content::RenderThreadImpl::HostAllocateSharedMemoryBuffer
 content.dll!content::RenderThreadImpl::AllocateSharedMemory
 ...
 content.dll!content::WebGraphicsContext3DCommandBufferImpl::CreateContext
+
+HANDLE LEAK
+name=https://crbug.com/487492
+system call NtCreateSection
+KERNELBASE.dll!CreateFileMappingW
+base.dll!base::SharedMemory::Create
+base.dll!base::SharedMemory::CreateAnonymous
+content.dll!content::ChildThreadImpl::AllocateSharedMemory
+...
+ppapi_proxy.dll!ppapi::proxy::PPB_ImageData_Proxy::CreateImageData
+
+HANDLE LEAK
+name=https://crbug.com/487492_b
+system call NtGdiCreateDIBSection
+GDI32.dll!CreateDIBSection
+skia.dll!`anonymous namespace'::CreateHBitmap
+...
+content.dll!content::PepperGraphics2DHost::Flush
+
+HANDLE LEAK
+name=https://crbug.com/487492_c
+system call NtCreateSection
+KERNELBASE.dll!CreateFileMappingW
+base.dll!base::SharedMemory::Create
+base.dll!base::SharedMemory::CreateAnonymous
+content.dll!content::ChildThreadImpl::AllocateSharedMemory
+...
+content.dll!content::PepperPluginInstanceImpl::PrepareTextureMailbox