Add Dr. Memory suppression file for pdfium tests

tools/drmemory/suppressions.txt

Index: tools/drmemory/suppressions.txt
diff --git a/tools/drmemory/suppressions.txt b/tools/drmemory/suppressions.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c6b8d8227be8b8e922a94058368f347dad6529df
--- /dev/null
+++ b/tools/drmemory/suppressions.txt
@@ -0,0 +1,27 @@
+# This file contains suppressions for the Dr.Memory tool, see
+# http://dev.chromium.org/developers/how-tos/using-drmemory
+
+
+# Intended alloc failure
+WARNING
+name=unittests:fxcrt.FX_AllocOverflow
+drmemorylib.dll!replace_calloc
+...
+*!fxcrt_FX_*AllocOverflow*_Test::TestBody
+
+# DrMem-i#471: simple floating register copy without meaningful usage
+UNINITIALIZED READ
+name=embeddertests:DrM-i#471
+*!v8::internal::RegisterValues::GetDoubleRegister
+*!v8::internal::FrameDescription::GetDoubleRegister
+*!v8::internal::Deoptimizer::CopyDoubleRegisters
+*!v8::internal::Deoptimizer::DoComputeCompiledStubFrame
+*!v8::internal::Deoptimizer::DoComputeOutputFrames
+*!v8::internal::Deoptimizer::ComputeOutputFrames
+*!v8::internal::`anonymous namespace'::Invoke
+*!v8::internal::Execution::Call
+*!v8::internal::Bootstrapper::CompileNative
+*!v8::internal::Bootstrapper::CompileExperimentalBuiltin
+*!v8::internal::Genesis::InstallExperimentalNatives
+*!v8::internal::Genesis::Genesis
+*!v8::internal::Bootstrapper::CreateEnvironment