Bug 864597: Adding b2g-info, a tool which displays information about B2G processes r...

...unning on a phone.

Example output:

	$ adb shell b2g-info
				 |     megabytes    |
		   NAME PID NICE  USS  PSS  RSS VSIZE OOM_ADJ USER
		    b2g 146    0 49.2 53.0 64.3 168.8       0 root
		  Usage 374   18 10.7 14.1 24.6  64.2       6 app_374
	     Homescreen 375   18 12.6 16.3 27.1  67.8       4 app_375
	(Preallocated a 383   18  7.9 10.7 20.4  58.6       6 root

	System memory info:
		    Total 176.5 MB
	     Used - cache  98.4 MB
	  B2G procs (PSS)  94.1 MB
	    Non-B2G procs   4.3 MB
	     Free + cache  78.1 MB
		     Free  39.2 MB
		    Cache  38.9 MB

	Low-memory killer parameters:
	  notify_trigger 10240 KB

	  oom_adj min_free
		6 20480 KB
		4  8192 KB
		3  7168 KB
		2  6144 KB
		1  5120 KB
		0  4096 KB

	$ adb shell b2g-info -t

				 |     megabytes    |
		   NAME TID NICE  USS  PSS  RSS VSIZE OOM_ADJ USER
		    b2g 146    0 49.2 53.1 64.3 168.8       0 root
	Binder Thread # 221    0
	Binder Thread # 227    0
		    b2g 247    0
	 Gecko_IOThread 249    0
	       XPCOM CC 250    0
	  Socket Thread 251    0
	   JS GC Helper 252    0
	JS Sour~ Thread 253    0
	    JS Watchdog 254    0
	   Hang Monitor 255    0
		    b2g 256    0
	     Compositor 257    0
	ImageBridgeChil 258    0
		  Timer 259    0
	     DOM Worker 260    0
	   JS GC Helper 261    0
	JS Sour~ Thread 262    0
	     DOM Worker 263    0
	     DOM Worker 264    0
	   JS GC Helper 265    0
	JS Sour~ Thread 266    0
	   JS GC Helper 267    0
	JS Sour~ Thread 268    0
	     DOM Worker 269    0
	   JS GC Helper 270    0
	JS Sour~ Thread 271    0
		    b2g 272    0
	    InputReader 273   -8
	    GonkSensors 274    0
	   HTML5 Parser 277    0
		    b2g 317    0
	      Cache I/O 321    0
	    Cert Verify 359    0
	     GL updater 362  -10
	  mozStorage #1 395    0
	Proxy R~olution 478    0
		    b2g 685    0
	-------------------------------------------------------------
		   NAME TID NICE  USS  PSS  RSS VSIZE OOM_ADJ USER
		  Usage 374   18 10.7 14.1 24.6  64.2       6 app_374
	Binder Thread # 438   18
	Chrome_ChildThr 439   18
	Binder Thread # 440   18
	       XPCOM CC 441   18
	   JS GC Helper 446   18
	JS Sour~ Thread 447   18
	    JS Watchdog 448   18
	  Socket Thread 449   18
	(Preallocated a 454   18
	ImageBridgeChil 455   18
		  Timer 477   18
	   HTML5 Parser 484   18
	-------------------------------------------------------------
		   NAME TID NICE  USS  PSS  RSS VSIZE OOM_ADJ USER
	     Homescreen 375   18 12.6 16.3 27.1  67.8       4 app_375
	Binder Thread # 384   18
	Chrome_ChildThr 385   18
	Binder Thread # 386   18
	       XPCOM CC 387   18
	   JS GC Helper 388   18
	JS Sour~ Thread 389   18
	    JS Watchdog 390   18
	  Socket Thread 391   18
	(Preallocated a 393   18
	ImageBridgeChil 394   18
		  Timer 397   18
	   HTML5 Parser 399   18
	-------------------------------------------------------------
		   NAME TID NICE  USS  PSS  RSS VSIZE OOM_ADJ USER
	(Preallocated a 383   18  7.9 10.7 20.4  58.6       6 root
	Binder Thread # 442   18
	Chrome_ChildThr 443   18
	Binder Thread # 444   18
	       XPCOM CC 445   18
	   JS GC Helper 450   18
	JS Sour~ Thread 451   18
	    JS Watchdog 452   18
	  Socket Thread 453   18
	(Preallocated a 456   18
	ImageBridgeChil 457   18
		  Timer 481   18

	System memory info:
		    Total 176.5 MB
	     Used - cache  98.4 MB
	  B2G procs (PSS)  94.2 MB
	    Non-B2G procs   4.3 MB
	     Free + cache  78.1 MB
		     Free  39.2 MB
		    Cache  38.9 MB

	Low-memory killer parameters:
	  notify_trigger 10240 KB

	  oom_adj min_free
		6 20480 KB
		4  8192 KB
		3  7168 KB
		2  6144 KB
		1  5120 KB
		0  4096 KB